[Vim] Add Apache config snippets
[Vim] Conceal mode line in help files
[Vim] Update styx.vim color scheme
[Bash] Add Cask directory to PATH
[Vim] Disable 'number', 'cursorline' sometimes

Disable them in contexts where not useful.
[Vim] Enable a couple CtrlP extensions

Bookmarks turned out to be useful and in particular the runtimepath
extension for quickly editing/viewing Vim scripts.
[Vim] Markdown file type edits

- Move Markdown-specific setting to ftplugin file
- Make gx work on Markdown links
[Vim][Git] Add GitHub username to config, snippets