docs: fix hard links [skip ci]

docs/markdown/Pkg-config-files.md

@@ -18,4 +18,4 @@ pkg.generate(libraries : libs,
 
 This causes a file called `simple.pc` to be created and placed into the install directory during the install phase.
 
-More infromation on the pkg-config module and the parameters can be found on the [pkgconfig-module](http://mesonbuild.com/Pkgconfig-module.html) page.
+More infromation on the pkg-config module and the parameters can be found on the [pkgconfig-module](Pkgconfig-module.md) page.

docs/markdown/index.md

@@ -33,13 +33,13 @@ developers. The first one is the mailing list, which is hosted at
 The second way is via IRC. The channel to use is `#mesonbuild` at
 [Freenode](https://freenode.net/).
 
-### [Projects using Meson](http://mesonbuild.com/Users.html)
+### [Projects using Meson](Users.md)
 
 Many projects out there are using Meson and their communities are also
 a great resource for learning about what (and what not too!) do when
 trying to convert to using Meson. 
 
-[A short list of Meson users can be found here](http://mesonbuild.com/Users.html)
+[A short list of Meson users can be found here](Users.md)
 but there are many more. We would love to hear about your success
 stories too and how things could be improved too!