chore: remove unused plugin and lerna package (#41258)

client/plugins/gatsby-remark-fcc-forum-emoji/index.js

@@ -1,26 +0,0 @@
-const visit = require('unist-util-visit');
-
-const emojiRE = /^:[a-z_]+:$/;
-
-function markdownToHTML(node) {
-  const { url, title, alt } = node;
-  const html = `
-  <img
-    alt="${alt}"
-    class="forum-image"
-    src="${url}"
-    title="${title}"
-    >
-  `;
-
-  return Object.assign(node, {
-    type: 'html',
-    value: html
-  });
-}
-
-module.exports = function forumEmojiPlugin({ markdownAST }) {
-  visit(markdownAST, 'image', imageNode =>
-    emojiRE.test(imageNode.title) ? markdownToHTML(imageNode) : imageNode
-  );
-};

client/plugins/gatsby-remark-fcc-forum-emoji/package-lock.json

@@ -1,5 +0,0 @@
-{
-  "name": "gatsby-remark-fcc-forum-emoji",
-  "version": "0.0.1",
-  "lockfileVersion": 1
-}

client/plugins/gatsby-remark-fcc-forum-emoji/package.json

@@ -1,5 +0,0 @@
-{
-  "name": "gatsby-remark-fcc-forum-emoji",
-  "private": true,
-  "version": "0.0.1"
-}