Social Icons: add Doctolib service

[cvlc12]

What?

This introduces a new Social Link icon, for the Doctolib service.

Why?

Doctolib offers profile pages that health professionals can use to list their presence on the web.

How?

This adds the new icon and service, as well as tests.

Testing Instructions

1. Go to Posts > Add New
2. Add the Social Links block
3. Within the block, add a new Gravatar block
4. Publish your post
5. View on the frontend.

Testing Instructions for Keyboard

No change

Note:I used #56544 as a template and changed filenames and svg icons only, so everything should be functionally equivalent

[github-actions]

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• Labels found: First-time Contributor, [Block] Social.

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[github-actions]

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[cvlc12]

Hi !

Are PRs like this one likely to be considered at all ?

Have a good day

[github-actions]

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[cvlc12]

Hi, just rebased as this is 4 months old now.

@ajitbohra is there anything else needed for this to be considered ?

[Mamaduka]

Closing in favor of #70261. The extensibility feature will ship in WP 6.9 and is already available in Gutenberg 21.1.

Here's an example plugin - https://github.com/wptrainingteam/devblog-custom-social-icons.