Remove unused, commented out CSS.

See #4102
Incrementing hard limits for Meta title and Meta description

closes #4124
- incremented values for client-side validation for Meta title and Meta description
- changed error messages to display the maximum number of characters.
Fix post settings menu cog alignment and colours
SERP style updates
Fix padding on content preview mobile views
Minor start on CSS Style cleanup

See #4107
Mobile bug fixes for users view
Fix overly tiny text
Fix broken link, remove old html files
Remove about page header on desktop

See #4116
Merge pull request #4118 from JohnONolan/053-fixes
Disable horizontal scrolling in right outlet

Closes #4131

- Adds `overflow-x: hidden;` to `.right-outlet`
Rewrite publish bar markup

Closes #4123, closes #4114, references #4105

- Rewrite to use flexbox for über mobile goodness
- Fixes tag suggestions (using the new dropdown style)
- Fixes vertical alignment
Merge pull request #4136 from PaulAdamDavis/fix-right-outlet

Disable horizontal scrolling in right outlet
Update icons
Merge pull request #4137 from JohnONolan/icon-refresh

Update icons
Updated dropdown component style
Merge pull request #4128 from PaulAdamDavis/fix-tags-input

Rewrite publish bar markup
Merge pull request #4126 from mattiascibien/issue-4124

Incrementing hard limits for Meta title and Meta description
Merge pull request #4139 from JohnONolan/dropdown-refresh

Updated dropdown component style