Update and add issue links to the docs

[siku2]

The documentation contains a few references to issues from the now archived yewstack/docs repository.
Since the docs repository is read-only, the same issues should be re-created here and the links in the docs should be updated to point to the new issue.

"Contribute to our docs" links

• Page: Components Lifecycle Diagram
  Previous issue: Add a diagram of the component lifecycle docs#22
• Page: Format module
  Previous issue: Explain the format module in depth docs#24
• Page: Using wasm-bindgen
  Previous issue: Explain how to setup a wasm-bindgen build environment docs#34

"TODOs" without links to issues

These currently don't link to an issue but probably should.

• Page: Testing
  Existing issues:
  - Add support for shallow rendering #1412
  - Expose component testing code to outsiders #1413

[titaneric]

Look forward to hearing the good news here, I really want to know the life cycle in Yew since I want to practice the Vue example in Yew. BTW, the diagram on previous issue is good!

[nwneisen]

I'd like to work on this as a way to start getting familiar with the project.

[gauravgautamgoldcast]

Hey all the documentation links give 404 now. This issue either needs to be updated to have correct links to the docs or closed as it is outdated.

[ranile]

The format module is removed so this things mentioned in this issue are done. Can we close this now?