Non-KIT: Community & SIG pages link to non-existing repo paths

### Affected source pages

- `./build/community/open-meetings/index.html:`
- `./build/community/products/index.html:`
- `./build/community/intro/index.html:`
- `./build/community/sigs/intro/index.html:`
- `./build/community/sigs/sig_release/index.html:`
- `./build/community/sigs/sig_infra/index.html:`
- `./build/community/sigs/sig_security/index.html:`
- `./build/community/sigs/sig_architecture/index.html:`

### Broken links (full URLs)

From `./build/community/open-meetings/index.html:`

- `[404] https://github.com/eclipse-tractusx/eclipse-tractusx.github.io/community/community/open-meetings.mdx`

From `./build/community/products/index.html:`

- `[404] https://github.com/eclipse-tractusx/eclipse-tractusx.github.io/community/community/products.mdx`

From `./build/community/intro/index.html:`

- `[404] https://github.com/eclipse-tractusx/eclipse-tractusx.github.io/community/community/intro.md`

From `./build/community/sigs/intro/index.html:`

- `[404] https://github.com/eclipse-tractusx/eclipse-tractusx.github.io/community/community/sigs/01_intro.md`

From `./build/community/sigs/sig_release/index.html:`

- `[404] https://github.com/eclipse-tractusx/eclipse-tractusx.github.io/community/community/sigs/04_sig_release.md`

From `./build/community/sigs/sig_infra/index.html:`

- `[404] https://github.com/eclipse-tractusx/eclipse-tractusx.github.io/community/community/sigs/02_sig_infra.md`

From `./build/community/sigs/sig_security/index.html:`

- `[404] https://github.com/eclipse-tractusx/eclipse-tractusx.github.io/community/community/sigs/03_sig_security.md`

From `./build/community/sigs/sig_architecture/index.html:`

- `[404] https://github.com/eclipse-tractusx/eclipse-tractusx.github.io/community/community/sigs/05_sig_architecture.md`