Clerk double-builds notebooks from :index, :paths

[sritchie]

If a notebook is set as :index, but is also specified in :paths (or picked up by a glob like src/** in :paths, it's built twice:

[sritchie@wintermute ~/code/clj/clerk-repro (main)]$ clj -X:nextjournal/clerk
👷🏼 Clerk is building 2 notebooks…
🧐 Parsing… Done in 45.463ms. ✅
🔬 Analyzing… Done in 156.340ms. ✅
🔨 Building "src/clerk_repro/notebook.clj"… Done in 10.982ms. ✅
🔨 Building "src/clerk_repro/notebook.clj"… Done in 6.527ms. ✅

See https://github.com/sritchie/clerk-repro,

clj -X:nextjournal/clerk

This is a cheap notebook so it doesn't matter, but for more expensive notebooks (like some of the physics simulations) this would be an issue.

[mk]

@sritchie good catch, fixed with 7222881.