* docs: Fix broken or dead links
Used the following commands to find broken links:
1. `lychee -E --dump https://freshrss.github.io/FreshRSS/en/ --include freshrss.github.io --output links.txt`
2. `lychee -v --suggest --archive wayback --timeout 5 -u "Mozilla/5.0 (X11; Linux x86_64; rv:148.0) Gecko/20100101 Firefox/148.0" --files-from links.txt --output output.txt`
3. `cat output.txt`
Then did the same for https://freshrss.github.io/FreshRSS/fr/
We could look into using lychee in CI:
https://github.com/lycheeverse/lychee?tab=readme-ov-file#github-action-usage
* Replace PostgreSQL 16 link with current version
Co-authored-by: Alexandre Alapetite <alexandre@alapetite.fr>
* Remove paragraph about bug message format
* Update README with official app website links
* Replace broken French images with English versions
* Fix broken Fever API docs link in French docs
* Replace GNU Social link with new one in `shares.php`
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Co-authored-by: Alexandre Alapetite <alexandre@alapetite.fr>
