Revert "Updating the 'about' page: remove timthumb and fancybox, add Magnific Popup. Fixes #1376"

This reverts commit 86ddf6b0ea38c7a8a9a98b99a99f9cd86150980e.
Merge branch 'release/1.6' of github.com:bolt/bolt into release/1.6
backport authenticate module
Merging
Merge branch 'release/1.6' of github.com:bolt/bolt into release/1.6
Merging
Only add a taxonomy, if the taxonomytype is actually set in the contenttype. Fixes #1443
RSS feed can have more than one field in a single tag. Fixes #1457
Updating lowlevelchecks. Allow 'postgresql' alongside 'postgres'.
Adding a bit of description when setting up the first user.
Update messages.nl.yml
Bumping version to 1.6.11
Merge pull request #1464 from jadwigo/release/1.6

backport authenticate module for branch 1.6
Fixing the form layout for "set up first user"
fix for error when db is not up to date and visitor is initialized
remove globals, use twig in templates to load the user
moving stuff around for working authenticate in 1.6"
updated documentation
Merge pull request #1484 from jadwigo/release/1.6

update to authenticate extension in 1.6
Update readme.md