Add info about web widget homepage (#65)

docs/releasenotes.mdx

@@ -13,6 +13,7 @@ Lots of bug fixes and new features!
 * New "help" view -- uses an embedded version of our doc site -- https://docs.waveterm.dev
 * [breaking] wsh getmeta, wsh setmeta, and wsh deleteblock now take a blockid using a `-b` parameter instead of as a positional parameter
 * allow metadata to override the block icon, header, and text (frame:title, frame:icon, and frame:text)
+* home button on web widget to return to the homepage, option to set a homepage default for the whole app or just for the given block
 * checkpoint the terminal less often to reduce frequency of output bug (still working on a full fix)
 * new terminal themes -- Warm Yellow, and One Dark Pro
 * we now support github flavored markdown alerts
@@ -94,4 +95,4 @@ Minor cleanup release.
 The new build is a fresh start, and a clean break from the current version. As such, your history, settings, and configuration will not be carried over. If you'd like to continue to run the legacy version, you will need to download it separately.
 
 
-Release Artificats and source code diffs can be found on (Github)[https://github.com/wavetermdev/waveterm].
+Release Artificats and source code diffs can be found on (Github)[https://github.com/wavetermdev/waveterm].