Site reorg: Remove site/ subpath (#306)

Unfortunately, for proper package pathing, need to remove the `site/`
subpath. This includes:
- Moving everything back into root
- Adding a `copy-site.sh` script to copy resources into `mkdocs/site/`
before building the site with mkdocs.
- Also update examples to ensure all are loading the local sw.js / ui.js
- Consolidate examples in `docs/examples`
- Consolidate assets under src/assets/
- Move `favicons` to root
- Reformat and relint
- Tests: update playwright tests to use mkdocs output, add test for
embed in docs
- bump to 2.0.0-beta.2

mkdocs/site/docs/user-guide/index.md

@@ -0,0 +1,28 @@
+# User Guide
+
+## Getting Started
+
+1. Check out [Loading Archived Items](loading.md) to point ReplayWeb.page towards the file you wish to view.
+2. Once your file has been loaded, [learn how to navigate the archived content](exploring.md)!
+
+## Supported Formats
+
+While ReplayWeb.page aims to support a variety of formats for archived web content, for best performance we recommend using WACZ files. To archive webpages to WACZ files on a per-page basis, we recommend [ArchiveWeb.page](https://archiveweb.page). If you need to archive entire websites, check out [Browsertrix](https://browsertrix.com).
+
+??? question "WARC?  WACZ?  What's the difference?"
+    Due to the nature of the WARC format, the entire file must be read on first use to generate an index — a list of all the pages and content available in the file used by ReplayWebpage to rebuild and display the archived content.
+
+    Inversely, WACZ files are always loaded on-demand and no indexing is required. The initial archive view should load very quickly as a result.
+
+    For users comfortable with the command line, we recommend converting WARC files to WACZ files by using the `wacz` python library, see [py-wacz on GitHub](https://github.com/webrecorder/py-wacz) for more information.
+
+ReplayWeb.page supports the following file formats listed as "Supported". Format type is determined based on the file's extension.
+
+| Format  | Extensions          | Status         |
+|:--------|:--------------------|:---------------|
+| WACZ    | `.wacz`             |  <span class="status-success">:bootstrap-check-circle-fill: Supported</span>     |
+| WARC    | `.warc`, `.warc.gz` |  <span class="status-success">:bootstrap-check-circle-fill: Supported</span>     |
+| HAR     | `.har`              |  <span class="status-success">:bootstrap-check-circle-fill: Supported</span>     |
+| WBN     | `.wbn`              |  <span class="status-danger">:bootstrap-x-octagon-fill: Not Supported</span>     |
+| ARC     | `.arc`              |  <span class="status-danger">:bootstrap-x-octagon-fill: Not Supported</span>     |
+| CDX     | `.cdx`, `.cdxj`     |  <span class="status-success">:bootstrap-check-circle-fill: Supported</span>     |