first stab at mkdocs migration

docs/news/posts/launching-merlin6-docs.md

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+---
+date:
+  created: 2019-06-12
+tags:
+  - getting_started
+---
+
+# Merlin 6 documentation available
+
+Merlin 6 docs are now available at <https://hpce.pages.psi.ch/merlin6>!
+
+More complete documentation will be coming shortly.

docs/news/posts/merlin7-preprod-docs.md

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+---
+date:
+  created: 2024-08-07
+tags:
+  - getting_started
+---
+
+# Merlin7 in preproduction
+
+The Merlin7 cluster is officially in preproduction. This phase will be tested by a few users
+and slowly we will contact other users to be part of it. Keep in mind that access is restricted.
+
+Merlin7 documentation is now available <https://hpce.pages.psi.ch/merlin7/slurm-configuration.html>.
+
+More complete documentation will be coming shortly.