builds and docs: fix #5568 (expansion) and #5793 (tslint + icons)

[julianobrasil]

fix #5568:

• docs(expansions): create docs for expansions

fix #5793:

• build: add tslint rule to enforce HTML tags escaping
  • The rule was built suposing that using backticks is enough to escape HTML tags in code multiline comments.
• docs(icons): Fix unescaped HTML tags in code comments

also did a cleanup in my fork (delete and forked it again): there was a lot of dirty commits in my history 😄

[jelbourn]

@julianobrasil can you please break these into separate PRs?

[julianobrasil]

Done.

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