Embed static resources (#1466)

* Replace pkger with go:embed for bundling the admin. Closes #844

* Remove references to pkged.go

* Point tests to use an updated version of Go

* Add comment to new exported function

* Cleanup

* Add a dummy pkged.go to alert people to stop using it.

* Add simple browser test to make sure the admin is available and renders

* Don't panic

* Embed bot/scraper metadata template.

Add browser test to validate the rendering of this template.

* Use embedded offline.ts segment

* Remove placeholder thumbnail as its unnecessary

* Remove copying the static directory into the release

* Cleanup

build/release/build.sh

@@ -67,7 +67,6 @@ build() {
 
   # Copy the production pruned+minified css to the build's directory.
   cp "${TMPDIR}tailwind.min.css" ./dist/${NAME}/webroot/js/web_modules/tailwindcss/dist/tailwind.min.css
-  cp -R static/ dist/${NAME}/static
   cp README.md dist/${NAME}
 
   pushd dist/${NAME} >> /dev/null