Add ImGui

Added Adamant

Change HTTPS to HTTP for Ada-Europe.org

Work around for the problem reported by the link checker (see issue #115)

New home for AdaChess in GitHub

Close #117

Add augusta

Two more libraries for units of measurement

Add URL for oggada

Fix branch name in action

Include bindings from phasercat.com

vulkada and adaogg

aunit: libre.adacore.com no longer available, linked to GitHub project

As any of the other collected open-source projects by AdaCore.

Update aflex-ayacc to the most up-to-date version

Pointing to the blog post because it explains how to use them together, but the repositories are here:

https://github.com/Ada-France/ayacc
https://github.com/Ada-France/aflex

Fix broken link to mckae-xml-ez-out

Changes for makewithada.org and ada-europe.org  about HTTP(S)

- Change www.makewithada.org to HTTP, since HTTPS raises error
- Change www.ada-europe.org to HTTPS, since it is working fine

About "mentioned" badge and format improvements

Remove dead link for matreshka

This was not made coherent in merge 2420c16

Work around the last problems reported by the linter

This works around these problems:

README.md:191:3:   https://matrix.to/#/#ada-lang_Lobby:gitter.im  remark-lint:double-link
README.md:199:112: https://matrix.to/#/#ada-lang:matrix.org       remark-lint:double-link

Which are due to an issue in the linter: https://github.com/Scrum/remark-lint-double-link/pull/10

Closes #107

Merge branch 'master' into awesome-lint-links

Merge branch 'master' into add-license-1

Fix typo and restore original wording