docs: Add a sentence or two to explain what Shorebird is.

chore: Move external images into repo

feat: Add a page which checks reachability of all our endpoints

build: Build Apk and exclude somes Abi

feat: Provide an ability to see which files are included in the patch

Is there a plan to support the OpenHarmony system?

fix: The hot update cannot be detected.

docs: Would like official documention on producing a Windows installer with Shorebird

docs(faq): update supported platforms

feat: Setup guide for GitLab