feat(curriculum): restore seed + solution to Chinese (#40683)

* feat(tools): add seed/solution restore script

* chore(curriculum): remove empty sections' markers

* chore(curriculum): add seed + solution to Chinese

* chore: remove old formatter

* fix: update getChallenges

parse translated challenges separately, without reference to the source

* chore(curriculum): add dashedName to English

* chore(curriculum): add dashedName to Chinese

* refactor: remove unused challenge property 'name'

* fix: relax dashedName requirement

* fix: stray tag

Remove stray `pre` tag from challenge file.

Signed-off-by: nhcarrigan <nhcarrigan@gmail.com>

Co-authored-by: nhcarrigan <nhcarrigan@gmail.com>

tools/formatter/add-seed-and-solution/plugins/text-to-data.js

@@ -0,0 +1,26 @@
+const stringify = require('remark-stringify');
+const { root } = require('mdast-builder');
+const unified = require('unified');
+const getAllBetween = require('../../../challenge-md-parser/mdx/plugins/utils/between-headings');
+
+const stringifyMd = nodes =>
+  unified()
+    .use(stringify, { fences: true, emphasis: '*' })
+    .stringify(root(nodes));
+
+// NOTE: we need a new plugin (rather than using the challenge parser's plugin)
+// simply because it adds html to the descriptions. It's easier to start from
+// scratch.
+function plugin() {
+  return transformer;
+
+  function transformer(tree, file) {
+    file.data.description = stringifyMd(getAllBetween(tree, '--description--'));
+    file.data.instructions = stringifyMd(
+      getAllBetween(tree, '--instructions--')
+    );
+  }
+}
+
+module.exports = plugin;
+module.exports.stringifyMd = stringifyMd;