bskyweb: proof-of-concept golang daemon to serve SPA (#275)

* gitignore: /dist/

* bskyweb: initial work-in-progress

* bskyweb: import icons from bluesky-website

* bskyweb: switch to pongo2 templates; iterate on views

* bskyweb: example.env (and docs)

* bskyweb: go fmt

* bskyweb: remove plan file

* bskyweb: README: tweak formatting

* prettier: ignore /dist/, bskyweb templates

---------

Co-authored-by: Paul Frazee <pfrazee@gmail.com>

bskyweb/templates/error.html

@@ -0,0 +1,15 @@
+{% extends "base.html" %}
+
+{% block head_title %}Error {{ statusCode }} - Bluesky{% endblock %}
+
+{# don't include the bundle on error pages #}
+{% block head_bundle %}{% endblock %}
+
+{% block body_all %}
+  {% if statusCode == 404 %}
+	  <h1>404: Not Found</h1>
+  {% else %}
+	  <h1>{{ statusCode }}: Server Error</h1>
+    <p>Sorry about that! Our <a href="https://bluesky.statuspage.io/">Status Page</a> might have more context.
+  {% endif %}
+{% endblock %}