Revert "remove CSS for #index-size until actually implemented"

This reverts commit c47c800de7c1b3dc00eac6424bce4a675ddcd35a.

Conflicts:
	src/General/css/style.css
Add `Image Size`.

Conflicts:
	CHANGELOG.md
	src/General/Build.coffee
	src/General/Config.coffee
	src/General/Index.coffee
	src/General/css/style.css