add juju-ha link and rename "High Availability" to "Charm High Availability"

remove info about Juju HA from Charm HA page and make a new page for Juju HA.
Adding a document for unmaintained charms.
Adding a link to the unmaintained charm process from the policy document.
Formatting updates to fix numbered list.
More formatting fixes.
Merge pull request #174 from natefinch/master

Move juju HA into it's own topic
Incorporating review suggestions.
Merge branch 'master' of https://github.com/juju/docs into unmaintained-charms
Make code samples consistent with the rest of the doc
Merge pull request #172 from chuckbutler/submission_userspace_focus

Make code samples consistent with the rest of the doc
Adds Digital Ocean provider docs, re-adds Joyent to the navigation.json, and supporting media files for DigitalOcean provider configuration.
Fixing wording on unmaintained charm process.
Merge pull request #175 from mbruzek/master

Unmaintained charm workflow (cuz bruzer is a BAWS)
Adds DigitalOcean to the proper navigation template, and adds suggested feedback for the document
Fixed a stray 'an'
Check for **Note or !!! ** fixes #159
Merge pull request #182 from marcoceppi/gh-159

Check for **Note or !!! ** fixes #159
Merge pull request #181 from chuckbutler/digitalocean

Adds Digital Ocean provider docs, re-adds Joyent to the navigation.json,...
Fix an overly large note that shoudl be a callout
Merge pull request #183 from chuckbutler/fix-deploying-note

Fix an overly large note that shoudl be a callout