port Installing extensions in parallel page to markdown

Author: orbsmiv

docs/installing-extensions-in-parallel.md

@@ -1,19 +1,3 @@
-# Installing extensions in parallel *(experimental!)*
-
-!!! warning
-    This page will soon replace <https://docs.easybuild.io/en/latest/Installing_extensions_in_parallel.html>.
-
-    **
-    It still needs to be ported from *reStructuredText* (.rst) to *MarkDown* (.md),  
-    and you can help with that!
-    **
-
-    - source: [`docs/Installing_extensions_in_parallel.rst` in `easybuilders/easybuild` repo](https://raw.githubusercontent.com/easybuilders/easybuild/develop/docs/Installing_extensions_in_parallel.rst)
-    - target: [`docs/installing-extensions-in-parallel.md` in `easybuilders/easybuild-docs` repo](https://github.com/easybuilders/easybuild-docs/tree/main/docs/installing-extensions-in-parallel.md)
-
-    See <https://github.com/easybuilders/easybuild-docs> for more information.
-
-```rst
 .. _installing_extensions_in_parallel:
 
 Installing extensions in parallel (experimental!)
@@ -123,5 +107,3 @@ The sanity checks that are done for each extension are still done through a sequ
 list of extensions.
 
 Additional work is needed to also run these checks in parallel across the cores that are available to EasyBuild.
-
-```