refactor: moved plugins to own folders

lib/details/plugin.js

@@ -0,0 +1,17 @@
+const markdownItContainer = require("markdown-it-container");
+
+const markdownItDetails = (md) => {
+  md.use(markdownItContainer, 'details', {
+    validate: (params) => params.trim().match(/^(.*)$/),
+    render: (tokens, idx) => {
+      const m = tokens[idx].info.trim().match(/^(.*)$/);
+      if (tokens[idx].nesting === 1) {
+        const title = md.utils.escapeHtml(m[1]);
+        return `<details class="expandable">\n<summary>${title}</summary>\n`;
+      }
+      return '</details>\n';
+    }
+  });
+};
+
+module.exports = markdownItDetails;