Add separate sections for Heroku and Vagrant deployments. Add guide for instance administration. Move 'Contribution guide' to 'Development guide'.

docs/Running-Mastodon/Administration-guide.md

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+Administration guide
+=================
+
+So, you have a working Mastodon instance... now what?
+
+## Administration web interface
+
+A user that is designated as `admin = TRUE` in the database is able to access a suite of administration tools:
+
+* View, edit, silence, or suspend users - https://yourmastodon.instance/admin/accounts
+* View PubSubHubbub subscriptions - https://yourmastodon.instance/admin/pubsubhubbub
+* View domain blocks - https://yourmastodon.instance/admin/domain_blocks
+* Sidekiq dashboard - https://yourmastodon.instance/sidekiq
+* PGHero dashboard for PostgreSQL - https://yourmastodon.instance/pghero
+* Edit site settings - https://yourmastodon.instance/admin/settings
+
+## Site settings
+
+Your site settings are stored in the `settings` database table, and editable through the admin interface at https://yourmastodon.instance/admin/settings.
+
+You are able to set the following settings:
+
+- Contact username
+- Contact email
+- Site description
+- Site extended description
+
+You may wish to use the extended description (shown at https://yourmastodon.instance/about/more ) to display content guidelines or a user agreement (see https://mastodon.social/about/more for an example).