additions (from f-droid) and some link updates

entries/mighty_knight.md

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+# Mighty Knight
+
+- Home: https://github.com/alketii/mighty-knight
+- State: mature, inactive since 2018
+- Download: https://f-droid.org/de/packages/io.github.alketii.mightyknight/
+- Platform: Android
+- Keyword: arcade
+- Code repository: https://github.com/alketii/mighty-knight.git
+- Code language: PHP, GDScript
+- Code license: MIT
+- Code dependency: Godot
+
+## Building