[📑🐞 Docs Bug]: Broken external links in contributor documentation

### Describe the bug you found in AsyncAPI Docs.

Several external links used across the AsyncAPI documentation are broken and return 404 pages.

The affected links point to:

- All Contributors documentation pages that were moved when the All Contributors website restructured its URLs from `/docs/en/` to `/en/reference/`
- The `TSC_MEMBERSHIP.md` file in the AsyncAPI Community repository, which was moved from the repository root to `docs/020-governance-and-policies/`

### Attach any resources that can help us understand the issue.

### Broken links

#### TSC Membership

**Old:**
[https://github.com/asyncapi/community/blob/master/TSC_MEMBERSHIP.md](https://github.com/asyncapi/community/blob/master/TSC_MEMBERSHIP.md)

**Current:**
[https://github.com/asyncapi/community/blob/master/docs/020-governance-and-policies/TSC_MEMBERSHIP.md](https://github.com/asyncapi/community/blob/master/docs/020-governance-and-policies/TSC_MEMBERSHIP.md)

#### All Contributors Specification

**Old:**
[https://allcontributors.org/docs/en/specification](https://allcontributors.org/docs/en/specification)

**Current:**
[https://allcontributors.org/en/reference/specification/](https://allcontributors.org/en/reference/specification/)

#### All Contributors Emoji Key

**Old:**
[https://allcontributors.org/docs/en/emoji-key](https://allcontributors.org/docs/en/emoji-key)

**Current:**
[https://allcontributors.org/en/reference/emoji-key/](https://allcontributors.org/en/reference/emoji-key/)

#### All Contributors Bot

**Old:**
[https://allcontributors.org](https://allcontributors.org)

**Current:**
[https://allcontributors.org/en/bot/](https://allcontributors.org/en/bot/)

### Code of Conduct

- [x] I agree to follow this project's Code of Conduct

### Are you willing to work on this issue?

Yes I am willing to submit a PR!

Search the AsyncAPI website repository for the listed old All Contributors and TSC_MEMBERSHIP.md URLs, then inspect each matching contributor-documentation page. Replace them with the current URLs provided in the issue and verify that the updated links no longer return 404 pages.

Written by the indexing model from the issue text.