Separate build outputs: moonweb -> dist/moonweb/, stefankoelle -> dist/stefankoelle/

- eleventy.config.js: output to dist/moonweb/ (was dist/)
- build-deploy-moonweb.yml: deploy from dist/moonweb/
- package.json: timecapsule copies to dist/moonweb/timecapsule/
- Rename prebuild -> prebuild:cv to prevent npm lifecycle hook from
  running before build (build-pdf.sh was contaminating dist/ with
  stefankoelle output)

eleventy.config.js

@@ -87,7 +87,7 @@ module.exports = function (eleventyConfig) {
     dir: {
       input: ".",
       includes: "shared/_includes",
-      output: "dist",
+      output: "dist/moonweb",
     },
     serverOptions: {
       host: "0.0.0.0",