Android 4.x ("K") release 46.7-k no longer works, remove from store and update docs

[UweTrottmann]

TheTVDB APIs still up?

Also Google Play Services updates will stop as of August 2023.

[UweTrottmann]

Still appears to work without issues, so leaving it in Play Store for the time being.

[UweTrottmann]

Due to Let's Encrypt encryption changes (no more cross-signing of root certificate #1026) images likely are no longer displayed.

[UweTrottmann]

As expected, images are no longer displayed. It's time to remove this from Play Store.

[UweTrottmann]

Removed from Play Store with release 2025.2.1.

Updated docs: https://github.com/UweTrottmann/SeriesGuide/blob/dev/docs/legacy-versions.md

Still have to update website, but need to do that anyhow with Android 5 release deprecation.