FIX: hardcode python path and change stylesheet path

.gitea/workflows/pmodules_check.yml

@@ -15,7 +15,7 @@ jobs:
     - name: Check modules
       run: |
         source /opt/psi/config/profile.bash
-        module load Python
+        module load Python/3.9.10
         export COLUMNS=9000
         export TERM='xterm'
         python3 -m venv pm_tools_venv
@@ -34,7 +34,7 @@ jobs:
             -a icons=font \
             -a source-highlighter=Pygments \
             -a experimental \
-            -a stylesheet=$CI_PROJECT_DIR/doc/stylesheets/readthedocs.css \
+            -a stylesheet=./stylesheets/readthedocs.css \
             -D public \
             -R doc '**/*.adoc'
         >