Enable documentation download in pdf format

[So-Fras]

Please check if the PR fulfills these requirements

• The commit message follows our guidelines

What kind of change does this PR introduce?
Documentation configuration update: allows to download readthedocs documentation in pdf format.

Does this PR introduce a breaking change or deprecate an API?

• Yes
• No

Other information
Readthedocs documentation on this subject is available here.

[So-Fras]

Test before merge on main:

• The flyout menu is not displayed when locally building the documentation.
• Solution: change the default branch in the project page to download_readthedocs branch and use latest version on the documentation page

[olperr1]

Test before merge on main:

• The flyout menu is not displayed when locally building the documentation.
• Solution: change the default branch in the project page to download_readthedocs branch and use latest version on the documentation page

This only works when the last readthedocs compilation concerns this branch.
(And changing the default branch may not be needed.)

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud