🔀 Merge #533: Fix broken documentation links in README

The README's Documentation and Getting Started links both point at pages
that no longer exist.

- Documentation: `/docs` → `/docs/welcome`
- Getting Started: `/docs/getting-started/using-animated-java` (404) →
`/docs/getting-started/installing`

Author: SnaveSutit

README.md

@@ -68,8 +68,8 @@ Animated Java is a cutting-edge Blockbench plugin designed for Minecraft: Java E
 
 # 📦 Installation
 
--   ❔ [Getting Started](https://animated-java.dev/docs/getting-started/using-animated-java)
--   📚 [Documentation](https://animated-java.dev/docs)
+-   ❔ [Getting Started](https://animated-java.dev/docs/getting-started/installing)
+-   📚 [Documentation](https://animated-java.dev/docs/welcome)
 -   🌐 [Website](https://animated-java.dev)
 -   🗣️ [Discord](https://animated-java.dev/discord)