Add gitlab.com mirror to external links

I have set up a mirror of the repository on gitlab.com
The git repository itself is mirrored/updated automatically
Issues are not updated automatically

README.md

@@ -1467,6 +1467,7 @@ See also [Documentation Generators](#documentation-generators), [Wikimatrix](htt
 - Lists of software aimed at privacy and decentralization in some form: [PRISM Break](https://prism-break.org/en/), [privacytools.io](https://www.privacytools.io/), [Alternative Internet](https://redecentralize.github.io/alternative-internet/), [Libre Projects](http://libreprojects.net/)
 - Dynamic Domain Name services: [Afraid.org](https://freedns.afraid.org/domain/registry/), [Pagekite](https://pagekite.net/)
 - Communities/forums: [/r/selfhosted](https://www.reddit.com/r/selfhosted), [IndieWeb](https://indieweb.org/)
+- Mirrors: [GitHub.com](https://github.com/Kickball/awesome-selfhosted), [Gitlab.com](https://github.com/nodiscc/awesome-selfhosted)
 
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