Update Localisation Guidelines

[BatoolMM]

Summary

This PR adds pointers to the localisation guidelines in the README and welcome page, along with updates to certain instructions in the guide.

Fixes #2961

List of changes proposed in this PR (pull-request)

• Added links to the localization guidelines in the README
• Added links to the localization guidelines in the welcome page
• Relocated the localization chapter
• Updated instructions for our localization co-working meetings

What should a reviewer concentrate their feedback on?

• Everything looks ok?

Acknowledging contributors

• All contributors to this pull request are already named in the table of contributors in the README file.

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[BatoolMM]

The CI is failing because of a problem with reference datastudygrouproche2020 which is getting fixed in #3150

[da5nsy]

This should now pass CI once the chapter title is updated - #3153 (comment) 😄

[da5nsy]

Hi @BatoolMM! Is this ready to merge?

[AndreaSanchezTapia]

Hi @da5nsy I'll review it and let you know when it's done. Thanks!

[BatoolMM]

Thank you @da5nsy and @AndreaSanchezTapia!

[melibleq]

I only made a couple suggestions for the content in book/website/index.md. Checked links in the deployed version to see if they're pointing to the correct pages and it all looks good to me!

[BatoolMM]

Thank you @melibleq @AndreaSanchezTapia and @da5nsy for the review 🌷
@da5nsy would you mind rebasing the PR if needed and merging it, when you have time, pls?