ts-rework: links at end, reorg. post-install

- Add links to the original page and to the main troubleshooting page
  at the end of each page
- Re-title some headers
- Consolidate boot/software/other issues into 'post-install issues'
- Add warning on ssloth and skater to prevent confusion of the two
- Reword landing page slightly

docs/troubleshooting-finalizing-setup.md

@@ -138,4 +138,14 @@ You didn't remove MSET9 on the previous page. The script will attempt to remove
 
 :::
 
-<!--@include: ./_include/troubleshooting-footer.md -->
+<!--@include: ./_include/troubleshooting-get-help-common.md -->
+
+---
+
+::: tip
+
+Go back to [Finalizing Setup](finalizing-setup)
+
+:::
+
+<!--@include: ./_include/troubleshooting-return.md -->