home page improvement

[keighrim]

Current "home" page of the app directory simply list all app names (randomly sorted) and all their versions (ascending order). A few improvements we can make quicky:

• add a RSS feed for new app publication (add feed to relevant slack channels) (610b0a9)
• re-order app names, pushing the latest publication to the top (3df1b13...cd16c99)
• re-order app versions, pushing the latest version to the top within the app section (3df1b13)
• app submitters to be shown next to the version, indicating app maintainer 3df1b13)
• app name to be shown with description value from its metadata from the latest version (3df1b13)
• I/O type-based "search" for apps #120
• add "soft-landing" pages for each app identifier (minus version number) (Broken links in app pages #155)
• add "copy-to-clipboard" next to ghcr image address