Dead link on AMP Translation Initiative

## 🐛 Bug Report

### Current behavior
A clear and concise description of the bug you found in amp.dev.

Please also provide:
- Page link: https://amp.dev/documentation/guides-and-tutorials/contribute/?format=websites
- (Optional) Screenshots/videos:

### Expected behavior/code
Open a page describing how to translate for the AMP project.

### Reproduction procedure
Please provide the steps to reproduce the problem:

1. Open amp.dev and head for Documentation -> Guides and Tutorials
2. Scroll down to the _Helping with translations_ section of _Providing content contributions to AMP_
3. Click the link on AMP Translation Initiative

- What browser are you using? Firefox 97.0.1
- What O/S are you using? Windows 10 21H2 (build 19044.1566)