Replace vim.opt with vim.o (nvim-lua#1495)

* Replace vim.opt with vim.o

Because it offers a nicer interface and info on hover.
For now leave vim.opt when using the table interface (until vim.o
with tables is implemented)

* Add type hint for vim.opt.rtp

* Add a comment about using vim.opt instead of vim.o

Author: oriori1703

init.lua

@@ -93,6 +93,12 @@ vim.g.have_nerd_font = true
 -- NOTE: You can change these options as you wish!
 --  For more options, you can see `:help option-list`
 
+-- Make line numbers default
+vim.o.number = true
+-- You can also add relative line numbers, to help with jumping.
+--  Experiment for yourself to see if you like it!
+-- vim.o.relativenumber = true
+
 -- Enable mouse mode, can be useful for resizing splits for example!
 vim.o.mouse = 'a'
 
@@ -117,6 +123,12 @@ vim.o.undofile = true
 vim.o.ignorecase = true
 vim.o.smartcase = true
 
+-- Keep signcolumn on by default
+vim.o.signcolumn = 'yes'
+
+-- Decrease update time
+vim.o.updatetime = 250
+
 -- Decrease mapped sequence wait time
 vim.o.timeoutlen = 300
 
@@ -142,7 +154,7 @@ vim.o.inccommand = 'split'
 vim.o.cursorline = true
 
 -- Minimal number of screen lines to keep above and below the cursor.
-vim.opt.scrolloff = 8
+vim.o.scrolloff = 10
 
 -- if performing an operation that would fail due to unsaved changes in the buffer (like `:q`),
 -- instead raise a dialog asking if you wish to save the current file(s)