Doc/Website follow-ups
### Content
- [x] #277+
- [x] #502+ (#179+)
- [x] #511+
- [ ] #514+
- [ ] Remove XMPP link/logo on the bottom-right corner
- [ ] Move to [ProperDocs](https://github.com/ProperDocs/properdocs)/[MaterialX](https://github.com/jaywhj/mkdocs-materialx) until Zensical gets usable?
- [The Slow Collapse of MkDocs](https://fpgmaas.com/blog/collapse-of-mkdocs/) Blog post
- [ ] #503+
- [ ] Add new content to documentation: #479+
- [ ] Improve index/readme/first page
- [ ] #494+
- [ ] Set up [`mkdocs-rss-plugin`](https://guts.github.io/mkdocs-rss-plugin/)
- Fix warnings about temporary files generated in `/tmp` for coverage and blog
- [ ] Website navigation thinking
- [ ] #468+: automatically generate screenshots
- [ ] Donation page: to Silkaj and Duniter projects (#199+)
- [ ] Integrate Ğ1 monetary license?
- [ ] Crowdfundings: [DeathReaper](https://moul.re/moul/silkaj.html)
### Zensical
- [ ] #512+
### Features
- …
### Set up new domain name
- [ ] Domain name: silkaj.${tld}?
- [ ] Choose domain name, rent it
- [ ] CNAME to pages.duniter.org
- [ ] Adapt NixOS/Nginx conf
- [ ] Set silkaj.duniter.org redirection to new domain
<!--
- https://en.wikipedia.org/wiki/.ml
- https://en.wikipedia.org/wiki/.lc
.click, .site, .website, .world
-->
issue