Adds auto instructions reply bot for merged pull requests

.github/workflows/bot.yml

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+name: Helper
+
+on:
+  pull_request_target:
+    types:
+      - closed
+
+jobs:
+  instructions:
+    name: instructions
+    runs-on: ubuntu-latest
+    if: 
+    steps:
+      - uses: actions/checkout@v2
+      - name: Comment
+        if: github.event_name == 'pull_request' && github.event.action == 'closed' && github.event.pull_request.merged == true
+        uses: actions/github-script@v3
+        with:
+          github-token: ${{secrets.GITHUB_TOKEN}}
+          script: |
+            const { hasLabel } = require(`${process.env.GITHUB_WORKSPACE}/scripts/action-utils.js`);
+            const { instructions } = require(`${process.env.GITHUB_WORKSPACE}/scripts/reply.js`);
+            if (hasLabel(context, 'domain'))
+              await instructions(context, github);

scripts/action-utils.js

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+module.exports = {
+  hasLabel: (context, label) => {
+    const pr = context.payload.pull_request || context.payload.issue;
+    const { labels = [] } = pr;
+
+    return !!labels.find(({ name }) => name === label);
+  },
+};

scripts/reply.js

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+
+const getInstructions = () => `
+The changes you have made will soon be reflected!!
+
+## Here\'s what you need to do next
+
+If your domain points to a server you own, add \`domain-name.is-a.dev\` to your server config.
+
+### For github pages users,
+* Go to your github page repo (\`user/user.github.io\`)
+* Open up the **settings** tab
+* Scroll down to the **Github pages** section
+* In the **Custom domain** text input, enter the domain you registered (\`domain-name.is-a.dev\`)
+* Give it some time to reflect and you should be good to go
+
+
+## Need support with your domain?
+If you are having trouble setting up your domain, [create an issue](https://github.com/is-a-dev/register/issues/new/choose) and pick the \`support\` template. Describe any issue you are facing there. I\'ll try my best to get back to you asap!
+
+
+## Love/Hate the service?
+**Love it?** Leave it a **star**! Also consider **[donating](https://github.com/is-a-dev/register#donations)** so that I can keep this service running forever.
+
+**Hate it?** Please leave your feedback by [creating an issue](https://github.com/is-a-dev/register/issues/new/choose). I\'d really like to keep improving this service for developers.
+`;
+
+module.exports = {
+  async instructions(context, github) {
+    const pr = context.payload.issue || context.payload.pull_request;
+    const { number } = pr;
+
+    await github.issues.createComment({
+      owner: context.repo.owner,
+      repo: context.repo.repo,
+      issue_number: number,
+      body: getInstructions(),
+    });
+  }
+};
+