Declare variables on the same line where they're first defined, instead
of at the top of the function.

This is a translation of commit 363134d28cb7ff8d2313278e1b4b6c09b5bf9bed
from CoffeeScript to JavaScript. Original commit message from
363134d28cb7ff8d2313278e1b4b6c09b5bf9bed:

When saving a draft to the drafts store, don't save changes for fields
which aren't actually set. This prevents us from accidentally later
restoring `null` to one of these fields.

Fixes an issue where creating an annotation when logged-out would result
in a null permissions field.

These were lost when translating annotation-test.coffee ->
annotation-test.js using the `coffee` command.

Tidy up the CoffeeScript-generated code in annotation-test.js.

These were lost when translate annotation.coffee to annotation.js using
the `coffee` command.

Tidy up the CoffeeScript-generated code in annotation.js.

annotation-test.js is just the output from `coffee -c ...` untouched.

directive/annotation.js is just the output from `coffee -c ...`,
untouched.

This is horrible, but while we're migrating this page to the app, this
is the quickest and easiest fix for the homepage typeface.

Remove Font Awesome and move add missing social media icons to H icon font

Font Awesome was used for the 4 icons on the homepage

 - Twitter, GitHub, RSS feed in the footer
 - 'Drag' icon in the bookmarklet installation instructions

Reduce page weight and simplify our lives by having all the icons
in a single icon font.

Validate incoming annotation data with jsonschema

Handle missing permissions on annotations more gracefully

Don't save null permissions/tags/text to drafts store

Ensure old sort control isn't shown in sidebar

When saving a draft to the drafts store, don't save changes for fields
which aren't actually set. This prevents us from accidentally later
restoring `null` to one of these fields.

Fixes an issue where creating an annotation when logged-out would result
in a null permissions field.

a055f4c inadvertently re-enabled showing the old annotation sort control
in the sidebar, as a result of the one remaining use of the ambiguous
"isStream" variable.

This commit ensures that "isStream" is only ever set on the actual
stream page, and not in the sidebar.

Fixes #2750.

Fix a font size on the front page

Move front page from WordPress into app

Keyboard focus the login form when shown

Automatically put the keyboard focus on the username field in the login
form when it's shown.

Fix sending of WebSocket messages enqueued during a disconnection

Any WebSocket messages submitted whilst the WS is disconnected
should be re-sent when the WS reconnects.

This was broken because upon a disconnect, the 'onclose'
event handler first synchronously called reconnect(), resulting
in a new WebSocket instance being created and then set 'socket'
to null. This caused an error in sendMessages() after the 'onopen'
event was triggered.

Fix the problem by not using a null 'socket' var to represent
a disconnected socket. Instead just use the WebSocket's readyState
property.

Also reduce these to just the one 152x152 icon instead of several
different ones. This should be sufficient. The tiny downside is that
older devices download the larger image and then rescale it.

This just copies the already compiled and minified main.css file into
the app, doesn't yet try to copy the source Sass files and recreate the
assets pipeline for them.

This uses a completely separate front_css webassets bundle for now, the
CSS for the front page should be integrated with that in the site_css
bundle later.

Remove unused `deleted` property handling

At some point in the distant past (7f36f3a) annotation deletes were
handled by adding the "deleted" property to annotations and anonymising
them. Now we actually delete them.

This commit removes code that was intended to handle such annotations.

Remove "show_unanchored_annotations" feature

We've discussed this feature and decided that it can't be turned on in
its current state. This commit removes it.

Note that the feature flag in `h/features.py` remains until these
changes are deployed out to production.