Remove feedback button

[MattiSG]

This changeset removes the floating feedback button that misleadingly looks like a “get help” button, always floating in the lower left corner of the documentation.

Rationale

1. No team actively monitors responses. Actually, until today, no maintainer knew the password to access the service collecting replies.
2. It is misleading. The drop rate (people clicking on it vs people leaving feedback) is 93% (4-to-60).
3. In 3 years, this form collected 4 responses, of which only 1 was useful, in 2019. It mentioned broken links, detection of which should be automated. All responses are given below.

Date	Time	Type	Comment
18 Jan 2022	18:57	I didn't find what I was looking for	No
10 May 2021	17:09	I didn't find what I was looking for	[email hidden] simulation droit aide au logement
19 Jan 2020	13:49	I think there is a mistake	g
3 Dec 2019	09:33	Section 3 of https://openfisca.org/doc/ , the web-api and python api links are broken	[email hidden]

[nikhilwoodruff]

Looks like the deploy-preview action fails because of this dependency issue.

[MattiSG]

Thanks @nikhilwoodruff! Indeed, all open PRs suffer from this blocking issue. It will be fixed once #264 is reviewed and merged 🙂

[MattiSG]

This shouldn't block a review though 😉

[nikhilwoodruff]

Looks good to me. @MattiSG what's the convention on approving review and test runs? Is it "merge if approvals and tests pass", or "merge if approvals". Seems like it's the latter.

[MattiSG]

Thanks @nikhilwoodruff! All our repositories are set to allow merge only when both tests pass and at least one maintainer approved the PR 🙂 You can find more information on Core's CONTRIBUTING file.

[sandcha]

Thank you @MattiSG!

[sandcha]

👍 And we are keeping the empty block to override the default block of the guzzle_sphinx_theme v.0.7.11 (the theme is used as template).