Install github-slugger and hast-util-to-jsx-runtime as devDependencies.
These are peer dependencies of @quartz-community/utils that must be present
for tsup's DTS build to resolve all transitive type imports.
satori, sharp, reading-time, and vfile are peerDependencies but needed
at build time for TypeScript declaration file generation via tsup.
Without them in devDependencies, the DTS build fails silently, producing
no index.d.ts — which causes the Quartz plugin index generator to skip
this plugin entirely.
Pre-built output is now committed to the repository so that
Quartz can skip the build step during plugin installation.
The prepare script is removed to prevent redundant builds
when installing from npm/git.
