Using Glosario via file copying (for now).

1.  Merge utility files in `./bin`.
1.  Modify build targets to force rebuild of bibliography and glossary.
1.  Rename `_` files and directories.

CONTRIBUTING.md

@@ -92,3 +92,15 @@ This project uses [Martha's Rules](https://journals.sagepub.com/doi/10.1177/0886
 
 1.  Run `npm run build` to build the the website in `_site`
     and `npm run serve` to serve it locally on port 4000.
+
+1.  Rebuilding the glossary takes a bit of work---we hope it will be easier once `glosario-js` is installable.
+    In the meantime:
+    1.  Clone <https://github.com/carpentries/glosario/> somewhere (not in this repository).
+    1.  Run
+
+        ```
+        bin/gloss-keys.js index.md */index.md | ~/glosario/utils/merge-glossaries.py -w - ~/glosario/glossary.yml > _glosario.yml
+        ```
+
+        to create a local slice of the Glosario data.
+    1.  Run `npm run gloss` to regenerate `gloss.md` by comining the glossaries.

bin/gloss-keys.js

@@ -0,0 +1,20 @@
+#!/usr/bin/env node
+
+import fs from 'fs'
+
+/**
+ * Extract all glossary keys from files for using in merging glossary.
+ */
+const main = () => {
+  const unique = new Set(
+    process.argv.slice(2).map(filename => {
+      const text = fs.readFileSync(filename, 'utf-8')
+      return [...text.matchAll(/<g\s+key="(.+?)">/g)]
+        .map(match => match[1])
+    }).flat()
+  )
+  console.log([...unique].sort().join('\n'))
+}
+
+// Run program.
+main()