bug 932108 - Tabzilla formatting issues

Repositioned the `Search` placeholder by adjusting the line-height. It was affected by css from the body.
Replace mixins.less & variables.less w/lib.less. Bug 1057419.

- Delete mixins.less & variables.less.
[fix bug 1060614] mozilla wordmark on homepage does not work in IE 6 & 7
[fix bug 1049042] Update Firefox OS FAQ page
[fix bug 1067281] Remove duplicate CSS files from bedrock pages

- /mission/
- /about/powered-by/
- /firefox/channel/
- /firefox/os/devices/
- /about/manifesto/
- /plugincheck/
- /privacy/ base template
- tabzilla.less imported lib.less twice
Fix bug 1066629: Add contribute.json
Add GoFox F15 phone to FxOS devices page. Bug 1065651.
Revert "Add GoFox F15 phone to FxOS devices page. Bug 1065651."

We will hold this until further notice.

This reverts commit 4a79bdd7fd3f03c7beef98beb717c7978a6f3969.
[fix bug 1043479] Update 'Nightly User' badge link on nightly firstrun page
[fix bug 1067691] Stop redirecting Firefox Sync pages to Mozilla Taiwan website
[fix bug 1067863] Next/Prev button flicker in onboarding tour
Fix bug 1068105: page helper to skip l10n redirect based on full request path.
Revert "Revert "Add GoFox F15 phone to FxOS devices page. Bug 1065651.""

This reverts commit 8ff201e3060ca0b7707076b9475dcbd5d593d2af.

Reverts all the way down.
Bug 1064318, Bug 1067333, Bug 1066151, Add new partners for France on devices page
Fix Bug 1068413 - Change canonical, alternate, and Open Graph URLs from HTTP to HTTPS
Add FxOS GoFox F15 purchase link. Bug 1065651.

- Also add O2 to list of operators for Alcaltel One Touch Fire
  E. Bug 1068819.
Update GoFox F15 device name. Bug 1065651.
Bug 1069240 - [Sync] Add extra class to display menu icon after the word
[no bug] Fix broken links to coding style guides in docs
Basic styles for security pages
(Bug 938605)