edit nav color

Fixes first menu element shows in dropdown menu

See merge request librewiki/Liberty-MW-Skin!68

Edit Authors

See merge request librewiki/Liberty-MW-Skin!67

Remove deprecated 'position' annotations from ResourceLoader module definitions

See merge request librewiki/Liberty-MW-Skin!66

Defining 'position' for a RL module has been deprecated since MW 1.29, as
per https://phabricator.wikimedia.org/T184257 and
https://gerrit.wikimedia.org/r/#/c/320315/

Performance: use $wgResourceModuleSkinStyles to load some CSS only when needed

See merge request librewiki/Liberty-MW-Skin!65

Now the CSS specific to Special:Preferences (and/or other (special) pages
using the "mediawiki.special.preferences.styles" ResourceLoader module)
will only be loaded there.
Because the ResourceLoader module "skins.liberty.styles" includes the
only-mw.css file, previously the #preftoc styles were loaded on all pages,
regardless of whether the CSS was needed there or not.

Also added an old CSS fix of mine for File: pages to fix some overlapping
issue with the social share buttons.

[skip ci]

Signed-off-by: Yongmin Hong <revi@pobox.com>

Allow turning the live recent changes feature off

See merge request librewiki/Liberty-MW-Skin!64

Explicitly declare skins.liberty.layoutjs module's dependency on core mediawiki.cookie module

See merge request librewiki/Liberty-MW-Skin!63

Don't output the meta description tag in the skin if an extension has already taken care of that

See merge request librewiki/Liberty-MW-Skin!62