Applications Document Overhaul by MartinR

- ROM Applications document has been consolidated into the Applications document
- Martin has done a significant overhaul of the Applications document

Co-Authored-By: MartinR <174514335+martinr-uk@users.noreply.github.com>

Source/Doc/ReadMe.md

@@ -114,7 +114,6 @@ Documentation for $doc_product$ includes:
 * $doc_user$
 * $doc_sys$
 * $doc_apps$
-* $doc_romapps$
 * $doc_errata$
 
 # Acknowledgments