chore(config): consolidate gitignore and restore _quarto.yml

- Add quarto/_quarto.yml to version control (HTML config)
- Remove quarto/_quarto.yml from root .gitignore
- Consolidate quarto/.gitignore into root .gitignore
- Add **/*.quarto_ipynb pattern to root .gitignore
- Delete redundant quarto/.gitignore file

.gitignore

@@ -32,6 +32,7 @@ __pycache__/
 /.quarto/
 /_book/
 /quarto/.quarto/
+**/*.quarto_ipynb
 
 # Build directory (new structure)
 /build/
@@ -157,5 +158,3 @@ quarto/_build/
 
 *.backup.*
 *.swp
-
-quarto/_quarto.yml

quarto/.gitignore

@@ -1,3 +0,0 @@
-/.quarto/
-
-**/*.quarto_ipynb

quarto/_quarto.yml

@@ -0,0 +1 @@
+config/_quarto-html.yml