Marksman changes (#1423)

* new NvChad Guide page - marksman.md (#1419)

* inserted image for marksman.md

* new NvChad Guide page - marksman.md

* Editing pass `marksman.md`

* # add `marksman.md` to the `.pages` file for display

---------

Co-authored-by: ambaradan <[email protected]>

Author: sspencerwire

docs/books/nvchad/.pages

@@ -7,5 +7,6 @@ nav:
     - ... | template_chadrc*.md
     - ... | nerd_fonts*.md
     - ... | vale_nvchad*.md
+    - ... | marksman*.md
     - NvChad UI: nvchad_ui
     - Plugins: plugins