'Latest release' info

**Short description**: Have a small block displaying the "Latest release" version name & release date and a "What's new" block displaying that version's 'What's new' info (as visible on Google Play and F-Droid). They should probably be visually connected (or a whole), and be updated automatically (without extra intervention for each new release).

**Location**: Homepage

**Why have this**: Show that AntennaPod is in active development; encourage visitors to download the app.

**More info**:
* We could either [create a dynamic section](http://stackoverflow.com/a/26454035) or maybe (don't know if this is possible) from the app's (GitHub) Actions set something in motion that updates the static website?
* The 'What's new' section could either display the text capped, with a 'read more' button that expands the block (if this whole thing is presented further down on the page, where it can take more space), or just display the version & date with a 'View what's new' button/link (if this whole thing is displayed prominently above the fold, where we want to keep the view clean).
* displaying the latest release version (date + version number) and a 'what's new' block