docs: improve content tab anchors on getting started (#1628)

Signed-off-by: Kyle Julian <38759683+kylejuliandev@users.noreply.github.com>

Author: kylejuliandev

mkdocs.yml

@@ -60,6 +60,9 @@ markdown_extensions:
           format: !!python/name:pymdownx.superfences.fence_code_format
   - pymdownx.tabbed:
       alternate_style: true
+      slugify: !!python/object/apply:pymdownx.slugs.slugify
+        kwds:
+          case: lower
   - tables
   - attr_list
   - md_in_html