fix: remove unused dependencies and specify missing dependencies (#7833)

* fix: remove unused dependencies from decap-cms-widget-richtext

* fix: move `ajv` dependencies to package that actually uses them

* fix: remove `dayjs` dependency from package that doesn’t use it

* fix: remove unused dependencies from decap-cms-widget-markdown

* fix: remove unused dependency from decap-server

* chore: remove axios in favour of native fetch

N.B. I’m not actually clear where or if the `functions/publish.js` file is ever run

* chore: removed unused `globby` dependency from monorepo root

* chore: remove more unused dependencies from packages

* chore: remove unused Babel plugin in monorepo root

* chore: specify per-package dependencies more precisely

This commit adds explicity dependency/dev dependency declarations that previously relied on implicit
presence of a dep from another monorepo package

* chore: found a few more missing deps

---------

Co-authored-by: Martin Jagodic <jagodicmartin1@gmail.com>

Author: delucis

functions/publish.js

@@ -1,5 +1,4 @@
 const crypto = require('crypto');
-const axios = require('axios');
 
 const verifySignature = event => {
   const timestamp = Number(event.headers['x-slack-request-timestamp']);
@@ -64,11 +63,10 @@ exports.handler = async function(event) {
     if (expectedCommand && expectedCommand === command) {
       const githubToken = process.env.GITHUB_TOKEN;
       const repo = process.env.GITHUB_REPO;
-      await axios({
+      await fetch(`https://api.github.com/repos/${repo}/dispatches`, {
         headers: { Authorization: `token ${githubToken}` },
-        method: 'post',
-        url: `https://api.github.com/repos/${repo}/dispatches`,
-        data: { event_type: 'on-demand-github-action' },
+        method: 'POST',
+        body: JSON.stringify({ event_type: 'on-demand-github-action' }),
       });
       const message = 'Dispatched event to GitHub';
       return { status: 200, body: message };