update documentation

docs/src/SUMMARY.md

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+# Summary
+
+[Introduction](README.md)
+
+# Nixapks Guide
+
+- [Building an App](building-an-app.md)
+- [Analyzing an APK File](analyzing-an-apk-file.md)
+- [Adding a New App](adding-a-new-app.md)
+- [Updating an App](updating-an-app.md)
+<!--
+# Android Development with Nix
+
+- [Frameworks and Tools](android-frameworks-and-tools.md) -->

docs/src/analyzing-an-apk-file.md

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+
+
+# Analyzing an APK File
+
+First build the app
+
+```sh
+nix build .#mihon
+```
+
+Then use `apktool` to decode the APK file
+
+```sh
+nix run nixpkgs#apktool -- d result
+```

docs/src/building-an-app.md

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+
+
+# Building an App
+
+Building an app is as easy as:
+
+```sh
+nix build .#app-name
+```