Merge pull request #1 from teharrison/master

use production invocation url for communities services
NAR-162 #comment The menu bar and Narrative title should now stay at the top of the page at all times.
Adjusted horizontal position of narrative title.
Added some further installation instructions to the Readme.md.
Fixed minor styling issue with the (now static) menu bar.
KBASE-794 #comment Adjusted styling so that the login button should look right.
Fixed broken %%inv_run cell magic, added convenience shortcuts for %inv_run ('%inv_run ls', for example), fixed a broken requirement.
Added a release notes file in markdown.
Updated release notes a bit.
Wrote a (currently small) narrative rebuild/redeploy script. This doesn't handle provisioning or deployment of everything on a fresh server, just building and tagging a new narrative.
Merge branch 'master' of https://github.com/kbase/narrative