jekyll: move jekyll back to root, but simpler setup, exclude via _config.yml

app: bundle jekyll docs into app, add 'yarn run docs' to build
ui: add back/forward arrows for app only, adjust responsiveness for app, add IS_APP flag injected via preload
ui: add animated logo, friendly message on empty replay frame
app: improve serve logic:
- serve static files from static root
- serve replay from http localhost instead to avoid proxying https for remote requests
- serve local lookup from http prefix also
- catch any fallthrough from replay as 404
- add timestamp to response channels to ensure uniqness

docs/supported-formats.md

@@ -0,0 +1,26 @@
+---
+layout: default
+title: 'Supported Formats'
+nav_order: 2
+description: 'Supported Formats'
+permalink: /docs/formats
+parent: Reference
+---
+
+## Supported Formats
+
+ReplayWeb.Page supports the following archive formats.
+Format is currently determined based on the extension, though more extensive detection may be added later.
+
+
+| Format  | Extensions          | Status        |     
+|:--------|:--------------------|:--------------|
+| WARC    | `.warc`, `.warc.gz` | <span class="d-inline-block p-2 mr-1 v-align-middle bg-green-000"> Supported     |
+| HAR     | `.har`              | <span class="d-inline-block p-2 mr-1 v-align-middle bg-green-000"> Supported     |
+| WBN     | `.wbn`              | <span class="d-inline-block p-2 mr-1 v-align-middle bg-yellow-000"> Experimental  | 
+| ARC     | `.arc`              | <span class="d-inline-block p-2 mr-1 v-align-middle bg-red-000"> Not Supported |
+| CDX     | `.cdx`, `.cdxj`     | <span class="d-inline-block p-2 mr-1 v-align-middle bg-green-000"> Supported |
+| ZIP     | `.zip`, `.waz`      | <span class="d-inline-block p-2 mr-1 v-align-middle bg-yellow-000"> In Progress |
+
+
+