This adds gopher support to WriteFreely -- both single- and multi-user
instances. It is off by default, but can be enabled with the new
`gopher_port` config value in the `[server]` section.

When enabled, multi-user instances will show all public blogs at
gopher://[host]:[gopher_port]/ -- otherwise, blogs are accessible at
gopher://[host]:[gopher_port]/[blog]/

This is just a proof of concept for now. We still need to handle some
edge cases and different configurations, like private instances.

Ref T559

Fix image extraction for social metadata

Update Contributing guide

Admin dashboard redesign

Closes T694

add js, jsx and html aliases for highlightjs

Ref T572

- Add a description to each config item
- Change item names to make more sense

Ref T694

Previously, we'd wait for a response before finishing app
initialization, meaning an overall slower startup. This fixes that.

Ref T572

Ref T694

This updates the guide to explain our current practices and processes.
It now focuses primarily on contributing code, instead of other types of
contributions.

Previously, image extraction wouldn't catch images with a query string
(or anything else) appended. This fixes that by parsing extracted URLs
and only checking the path for what looks like an image file.

Previously, we didn't extract images for draft posts. This fixes that.

Fix post deletion on Pleroma

Logs requests when --debug enabled, and always logs errors from the
check.

Ref T572

This keeps track when automated update check fails, and displays a
relevant message to the admin on /admin/updates

Ref T572

When a WriteFreely update is available, indicate this on the "Updates"
navigation item

Ref T572

Ref T572

- Tweak the copy
- Include link to download latest release
- Change the version status design a bit
- Restyle some text

Update Dockerfile - Go / Alpine base images

Consistent backend page design

add update checks

Closes T572

This adds a new config option that signifies the admin doesn't need to
see deeply technical things, like application resource usage. In the
[app] section, set forest = true to enable this.

Ref T694

This moves app config to a "Settings" page and the application monitor
to a "Monitor" page. It also reworks the admin navigation bar a bit and
adds some instance stats on the dashboard.

Ref T694

instead of h2s. This also removes odd one-time class usages on Account
Settings page.

update golang.org/x/crypto vendor to use acme v2

Improve resource use for federation

Rename Suspend status to Silence

Ref T661

Ref T661

add silenced warning on invites page

Ref T661

Ref T661

fixes imported post times

Require authenticated user on draft edit routes

Restrict /invite/{code} route to valid chars