feat!: Separate www into www/blog and www/private

Now the private content is stored as a git submodule.
This means I can keep that repo's source private, but still use it in
the build product.
The build product (website) relies on HTTP basic authentication, so
access control is maintained throughout the SDLC.

todo.txt

@@ -1,8 +1,5 @@
-Personalize the index page.
-Personalize the introduction page of the blog.
-
+Split www into www/blog, www/content, and www/assets
 Determine which articles should be incorporated into the website
-Integrate photos for recipes
 Build out the Copper Chronicle
 Fill out the DefCon article
 Fill out the Oktoberfest article with old physical notes in big binder
@@ -40,3 +37,6 @@ x 2026-03-22 Remove the one line descriptions from the menu.
 x 2026-03-22 Move the resume to the private section and add the lock symbol.
 x 2026-03-23 Reduce the CSS where possible. Match my website's theme to align with mdbook's theme.
 x Set up nightly builds
+x Personalize the index page.
+x Personalize the introduction page of the blog.
+