Merge 'upstream' timeoutlen, cmp scroll, friendly snippets, luasnip, ruby

Merged:
- fix: disable ts indenting for Ruby
- doc: add note about advanced luasnip features
- Move friendly snippets to dependencies of LuaSnip (#759)
- Add <C-b>/<C-f> cmp mapping to scroll cmp docs (#750)
- doc: add info about timeoutlen (#691)

lua/options.lua

@@ -35,6 +35,9 @@ vim.opt.signcolumn = 'yes'
 
 -- Decrease update time
 vim.opt.updatetime = 250
+
+-- Decrease mapped sequence wait time
+-- Displays which-key popup sooner
 vim.opt.timeoutlen = 300
 
 -- Configure how new splits should be opened