Stop tracking generated Frame Home binaries

Remove generated payload files and the source stamp from the repository while
keeping the installer source.
Update the updater and documentation for the shared Studio and Frame Home releases.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

.gitignore

@@ -1,6 +1,10 @@
 # build output
 /build*/
 /dist/
+/frame/payload/bin/
+/frame/payload/layer/libframe_home_layer.so
+/frame/payload/layer/env_ps.spv
+/frame/payload/SOURCE
 studio/build*/
 tools/*/build*/
 # editor / OS clutter