Adjust and generalize gitignore patterns

This prepares us to add new Lambdas that run periodically with
https://arc.codes/docs/en/reference/project-manifest/scheduled.

.gitignore

@@ -3,7 +3,7 @@ node_modules
 # Generated by `npm run dev`, `npm run build`, etc.
 /.cache
 /build/static
-/build/server/metafile.*
+/build/**/metafile.*
 /build/**/index.*
 /coverage
 *.tsbuildinfo

package.json

@@ -19,7 +19,7 @@
     "dev": "run-p \"dev:*\"",
     "prepare": "husky install",
     "deploy": "arc deploy --no-hydrate --prune --production",
-    "clean": "rimraf --glob build/static app/css build/server/index.* build/server/metafile.* \"app/**/*.css\" \"app/**/*.css.map\" build/email-incoming build/table-streams sam.json sam.yaml .cache",
+    "clean": "rimraf --glob build/static app/css \"build/**/index.*\" \"build/**/metafile.*\" \"app/**/*.css\" \"app/**/*.css.map\" sam.json sam.yaml .cache",
     "test": "jest",
     "test-coverage": "jest --coverage",
     "typecheck": "tsc"