refactor: Add js-yaml dep, scrtipt gen tweaks.

*  Make the synthetic "base name" property double underscore prefixed,
  since internal, and to avoid future conflicts w/ YAML format add'ns.
* Switch to PS hash dictionaries for our metadata collections for saner
  data inspection/use.

docs/src/hardware-metadata-collection-plugin/index.js

@@ -12,7 +12,7 @@ const glob = require("glob");
 function generateHardwareMetadataAggregate() {
   glob("../app/boards/**/*.zmk.yml", (error, files) => {
     const aggregated = files.flatMap((f) =>
-      yaml.safeLoadAll(fs.readFileSync(f, "utf8"))
+      yaml.loadAll(fs.readFileSync(f, "utf8"))
     );
     fs.writeFileSync(
       "src/data/hardware-metadata.json",