IMPROVEMENT: Use better and shorter github actions names

.github/workflows/markdown-link-check.yml

@@ -1,4 +1,4 @@
-name: Check Markdown links
+name: Markdown links
 
 on: push
 

.github/workflows/markdown-lint.yml

@@ -1,4 +1,4 @@
-name: Lint Markdown
+name: Markdown
 
 on: push
 

.github/workflows/unit-tests.yml

@@ -1,4 +1,4 @@
-name: Python unit-tests
+name: unittest
 
 on:
   push:

.github/workflows/unittests.yml

@@ -1,4 +1,4 @@
-name: Pytest unittests
+name: Pytest
 
 # https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-python#packaging-workflow-data-as-artifacts