Build for Cloudflare Pages instead of Jekyll

The site is a Python/Jinja2 static generator, but a stray Gemfile made
Cloudflare auto-detect Jekyll and fail. Point generate-html.py at the real
_posts/ dir and have it build a self-contained dist/ (rendered HTML plus
copied styles/images/book), then drop the Jekyll triggers (Gemfile,
Gemfile.lock, _config.yml, .nojekyll) so Pages runs the Python build instead.

Generated output (index.html, blog/, rss.xml) is no longer committed since
Pages rebuilds it on every push. Configure the Pages project with build
command `python generate-html.py` and output directory `dist`.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: bobthemighty

.gitignore

@@ -1,2 +1,3 @@
 .venv
 *.pyc
+dist/

.nojekyll

@@ -0,0 +1 @@
+3.13

.python-version

@@ -3,8 +3,11 @@ all: build update-book serve
 build:
 	./generate-html.py
 
-serve:
-	python -m http.server 8899
+serve: build
+	cd dist && python -m http.server 8899
+
+preview: build
+	npx wrangler pages dev dist
 
 watch-build:
 	ls **/*.md **/*.html **/*.xml *.py | entr ./generate-html.py