Update mnotify

.github/CODEOWNERS

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+# https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/about-code-owners
+gatsby/content/blog/**/*synapse*.mdx @matrix-org/synapse-core

.github/_typos.toml

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+[files]
+extend-exclude = [
+	"*.js*", "*.json", "*.svg",
+	"/unstyled_docs",
+	"/gatsby/content/blog/2020/09/2020-09-04-twim.mdx", # contains typos which are correct in context of their project
+	"/gatsby/content/blog/2020/12/2020-12-18-a-twim.mdx", # contains intentional typos
+	"/gatsby/content/blog/2021/09/2021-09-17-twim.mdx", # contains French, for some reason
+	"/gatsby/content/blog/2022/01/2022-01-21-twim.mdx", # pings scoreboard triggers the typo CI
+    "/gatsby/content/blog/2022/05/2022-05-13-twim.mdx", # typo found in a url
+	"/gatsby/content/blog/2022/07/2022-07-08-twim.mdx", # whos in that room
+	"/gatsby/content/blog/2022/08/2022-08-12-twim.mdx", # tha'
+	"/gatsby/content/blog/2022/12/2022-12-16-twim.mdx", # name triggers error
+	"*signed*.txt", # can be removed once https://github.com/crate-ci/typos/issues/401 is fixed
+	"synapse-debian-security-announcement.asc" # has typo but cannot fix due to PGP signature
+]
+
+[default]
+locale = "en"
+check-filename = false
+
+[default.extend-identifiers]
+3uNd3 = "3uNd3"
+96e9afe6 = "96e9afe6"
+LaterGuage = "LaterGuage"
+
+[default.extend-words]
+ba = "ba"
+contributeurs = "contributeurs"
+feld = "feld"
+Flate = "Flate"
+inex = "inex"
+Konversation = "Konversation"
+oder = "oder"
+onl = "onl"
+tbe = "tbe" # part of youtube video ID
+clos = "clos" # can be changed to json-clos once https://github.com/crate-ci/typos/issues/400 is fixed
+ehr = "ehr" # can be changed to Fuj'ehr once https://github.com/crate-ci/typos/issues/400 is fixed
+ist = "ist" # can be changed to raim.ist once https://github.com/crate-ci/typos/issues/400 is fixed
+loca = "loca" # can be changed to loca.lt once https://github.com/crate-ci/typos/issues/400 is fixed
+ons = "ons" # can be removed once https://github.com/crate-ci/typos/issues/400 is fixed
+ERRO = "ERRO" # can be removed once https://github.com/crate-ci/typos/issues/399 is fixed
+MESSAG = "MESSAG" # can be removed once https://github.com/crate-ci/typos/issues/399 is fixed

.github/workflows/build-matrix.org.yml

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+name: "🌐 Build the matrix.org website"
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+  workflow_dispatch:
+
+# only allow one build per PR: cancel any existing ones.
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  # Apply styling to the spec documents.
+  # This step also sets up the OpenAPI UI.
+  build-spec:
+    name: "📖 Legacy spec"
+    runs-on: ubuntu-latest
+    steps:
+      - name: "📥 Source checkout"
+        uses: actions/checkout@v2
+        with:
+          submodules: 'recursive'
+      - name: "📖 Update docs"
+        run: |
+          scripts/update_docs.sh
+      - name: "⚙️ Create output directory for Sass"
+        run: mkdir -p content/docs/css
+      - name: "🚧 Transform Sass"
+        uses: gha-utilities/sass-build@04542d49f28015d06d2a06f3b48bf72bfa76a6b3 
+        with:
+          source: legacy-spec/scss/main.scss
+          destination: content/docs/css/main.css
+      - name: "📦 Tarball creation"
+        run: tar -czf styled-docs.tar.gz content/docs
+      - name: "📤 Artifact upload"
+        uses: actions/upload-artifact@v2
+        with:
+          name: styled-docs-artifact
+          path: styled-docs.tar.gz
+
+  # Run gatsby.
+  build-gatsby:
+    name: "🌐 Gatsby"
+    runs-on: ubuntu-latest
+    steps:
+      - name: "📥 Source checkout"
+        uses: actions/checkout@v2
+      - name: "⚙️ Setup node"
+        uses: actions/setup-node@v2
+        with:
+          node-version: '14'
+      - name: "📝 Gatsby dependencies cache"
+        uses: actions/cache@v2
+        with:
+          path: |
+            gatsby/node_modules
+          key: ${{ runner.os }}-gatsby-deps-${{ hashFiles('gatsby/package-lock.json') }}
+      - name: "⚙️ Install Gatsby"
+        run: npm install
+        working-directory: gatsby
+      - name: "📝 Gatsby build cache"
+        uses: actions/cache@v2
+        with:
+          path: |
+            gatsby/public
+            gatsby/.cache
+          key: ${{ runner.os}}-gatsby-build-${{ github.run_id }}
+          restore-keys: |
+            ${{ runner.os }}-gatsby-build-
+      - name: "🚧 Gatsby build"
+        run: npm run build
+        working-directory: gatsby
+        env:
+          GATSBY_EXPERIMENTAL_PAGE_BUILD_ON_DATA_CHANGES: true
+          CI: true
+      - name: "📦 Tarball creation"
+        run: tar -czf gatsby-site.tar.gz public
+        working-directory: gatsby
+      - name: "📤 Artifact upload"
+        uses: actions/upload-artifact@v2
+        with:
+          name: gatsby-artifact
+          path: gatsby/gatsby-site.tar.gz
+
+  build-guides:
+    name: "📖 Implementation guides"
+    runs-on: ubuntu-latest
+    container:
+      image: "buildpack-deps"
+    steps:
+      - name: "📥 Source checkout"
+        uses: actions/checkout@v2
+      - name: "🚧 Build implementation guides"
+        run: |
+          wget https://github.com/rust-lang/mdBook/releases/download/v0.4.1/mdbook-v0.4.1-x86_64-unknown-linux-gnu.tar.gz
+          tar -xf mdbook-v0.4.1-x86_64-unknown-linux-gnu.tar.gz
+          ./mdbook build server -d ${GITHUB_WORKSPACE}/implementation-guides/implementation-guides/server
+          ./mdbook build client -d ${GITHUB_WORKSPACE}/implementation-guides/implementation-guides/client
+          ./mdbook build application-services -d ${GITHUB_WORKSPACE}/implementation-guides/implementation-guides/application-services
+          cp index.html ./implementation-guides/
+        working-directory: implementation-guides
+      - name: "📦 Tarball creation"
+        run: tar -czf implementation-guides.tar.gz implementation-guides
+        working-directory: implementation-guides
+      - name: "📤 Artifact upload"
+        uses: actions/upload-artifact@v2
+        with:
+          name: guides-artifact
+          path: implementation-guides/implementation-guides.tar.gz
+
+  # Merge the three sets of outputs together, together
+  # with the existing static stuff in `content`.
+  package:
+    name: "📦 Package"
+    runs-on: ubuntu-latest
+    needs: [build-spec, build-gatsby, build-guides]
+    steps:
+      - name: "📥 Source checkout"
+        uses: actions/checkout@v2
+      - name: "📥 Spec artifact download"
+        uses: actions/download-artifact@v2
+        with:
+          name: styled-docs-artifact
+      - name: "📥 Gatsby artifact download"
+        uses: actions/download-artifact@v2
+        with:
+          name: gatsby-artifact
+      - name: "📥 Implementation guides artifact download"
+        uses: actions/download-artifact@v2
+        with:
+          name: guides-artifact
+      - name: "📦 Merge archives"
+        run: |
+          tar -xzvf styled-docs.tar.gz
+          tar -C content --strip-components=1 -xzf gatsby-site.tar.gz
+          tar -C content -xzf implementation-guides.tar.gz
+          tar -czf content.tar.gz content
+      - name: "📤 Artifact upload"
+        uses: actions/upload-artifact@v2
+        with:
+          name: merged-content-artifact
+          path: content.tar.gz