Enhance Android SDK docs

[NikolaRusakov]

Content

1. introduces Mermeid.js plugin to Docusaurus in order to render visual diagrams
2. adds key details and missing instructions in introduction section
3. restructures Android SDK page hierarchy to make it flow better (WIP)
4. Copy pastes Starter sections from Integrate page from Tolgee Platform
   Demonstrates flow of Documentation-first versus Starter-first principles
   • https://github.com/tolgee/tolgee-platform/blob/70da3ef985495d20cafb76fa4982ea7218e51585/webapp/src/views/projects/integrate/guides/AndroidViews.mdx
   • https://github.com/tolgee/tolgee-platform/blob/70da3ef985495d20cafb76fa4982ea7218e51585/webapp/src/views/projects/integrate/guides/AndroidJetpackCompose.md

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