Doc web custom login page config. See #11961
Only show custom login image via url
Add custom login logo doc to Windows install-web
document new // separator in omero.fs.repo.path

reflects changes arising from fixing
http://trac.openmicroscopy.org.uk/ome/ticket/12160
adjust for permitting no root-owned directories
warn that in-place ln_s import can be slower

see https://trac.openmicroscopy.org.uk/ome/ticket/12217
The password reset command was missing.

Note I'm not sure if this is still correct for the new salted passwords.
Rewrite the password reset instructions

Removed old openssl commands
emphasize user ownership in bold
Merge pull request #786 from mtbc/rebased/develop/in-place-warning

warn that in-place ln_s can be slower for HCS (rebased from dev_5_0)
Merge pull request #795 from manics/rebased/develop/root_password_reset

Root password reset command (rebased onto develop)
Merge pull request #782 from will-moore/rebased/develop/custom_web_login_11961

Custom web login 11961 (rebased onto develop)
Merge pull request #783 from mtbc/rebased/develop/template-path-ownership

document new // separator in omero.fs.repo.path (rebased from dev_5_0)
Edit on GitHub extension for sphinx
Fix edit_on_github extension
Move _ext and _templates to common/
Add .gitignore to ext/
Add option to specify edit_on_github_prefix value

Fix omero/conf.py to use 'omero' as the prefix
Fix Edit on GitHub branch and prefixes
Update index.txt

Add sentence about the new "Edit on GitHub" button
as a test of the new "Edit on GitHub" button.

Cheers,
~@joshmoore