Update installation instruction to make them easier to understand the first time.
fix bug 982942: Ensure section IDs injected for ?raw; performance tweaks

* Ensure that section IDs are injected into content fetched via
  ?raw, which also fixes section extraction for ?raw&section=foo

* Further reduce the instances where wiki.content.parse() is called
  during the view critical path, limiting it to just the few remaining
  cases in _filter_doc_html()

* Left some TODO comments as notes for some next steps in view
  optimization
Remove the reviewed and reviewer fields and their usage.
Add migration to remove reviewed and reviewer columns.
One last reviewed
More review removal.
Merge remote-tracking branch 'upstream/master'
Update documentation to provide a more straight forward setup with vagrant
fix bug doc-delete-981147 - Prevent deleted pages from being indexed.
Merge pull request #2125 from rlr/and-some-more

Remove the reviewed and reviewer fields and their usage.
Merge pull request #2160 from darkwing/doc-delete-981147

Fix bug 981147 - Prevent deleted wiki documents from being indexed
Remove unused var
Merge pull request #2168 from darkwing/doc-var-update

Remove unused var
Merge pull request #2147 from lmorchard/982942-inject-section-ids-for-raw

fix bug 982942: Ensure section IDs injected for ?raw; performance tweaks
fix a typo
Merge pull request #2126 from JeremiePat/master

Update installation instruction
List top level docs and docs without parent
Update, remove old design styles in mdn-screen.css

Rules that are still needed are moved to Stylus and updated to work
correctly alongside styles from the new design. Along the way, page
elements and even entire pages are updated to adhere to conventions of
the new design. Spacing is adjusted, colors are updated, responsive
layouts are added, and more.

The design of the Demo Studio is not updated (and Demo Studio rules are
not moved to Stylus) because a project is already planned to completely
redesign these pages. Significant user-facing improvements are made to
the learning pages, but some learning page rules are copied directly
from mdn-screen.css and left untouched. The quality of the underlying
implementation matters very little, in my opinion, as the next major
user-facing change to these pages will likely be removal.
Merge pull request #2166 from Elchi3/without-parent

List top level docs and docs without parent
Merge pull request #2079 from openjck/migrate-mdn-screen.css

Update, remove old design styles in mdn-screen.css