Fix 'Basics of HTML' broken link

The original link pointing to the Opera dev website was broken as the
document has been moved to the Webplatform site instead.

This commit fixes the link accordingly (reverts d8b7b8042c5 which removed
it entirely).
fix bug 1050991 - Add icons to all notifications
fix bug 1049958 - Remove cursor pointer from login widget
fix bug 1050971 - Ensure login widget stays open for keyboard
fix bug 1050536 - Set min-width for login buttons
Merge pull request #2652 from darkwing/1049958-cursor

fix bug 1049958 - Remove cursor pointer from login widget
Make sure we're handling empty email address data properly when populating the signup form choices. Fixes bug #1051782.
Merge remote-tracking branch 'darkwing/1050991-notifications'
Improved the account disconnection error message to look like a real error notification. Refs bug #1050008.
Merge remote-tracking branch 'darkwing/1050971-login'

Conflicts:
	media/redesign/stylus/main/structure.styl
Merge remote-tracking branch 'darkwing/login-links'
Merge pull request #2645 from vrubiolo/master

Fix 'Basics of HTML' broken link
fix bug 1051019 - Make inputs more responsive
fix bug 1050499 - Add icons for accounts
Merge pull request #2657 from darkwing/1050499-icons

fix bug 1050499 - Add icons for accounts
Merge pull request #2656 from darkwing/1051019-form

fix bug 1051019 - Make inputs more responsive
Increased the timeout for the wheel download task to help @iakshay
Added the correct persona audience to the Django settings as now required by django-allauth.