Actions: comments & stale management (#466)

Updated stale workflow to include PRs
Upgraded assignee issue comment with markdown using github/script
New first interaction workflow for contributors who open PRs without being assigned issues

.github/workflows/community-first-pr-comment.yml

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+# This workflow comments on PRs opened by first time contributors.
+# Reminds first timer contributors to associate their PR with an issue and follow the guidelines.
+# See for more info: https://github.com/actions/first-interaction
+
+name: First Interaction PR Comment
+
+on: [pull_request]
+
+jobs:
+  greeting:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/first-interaction@v1
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+          pr-message: "First time contributors to Chayn: Please make sure that this PR is linked to an issue you are assigned! We will not merge contributor PRs without a linked assigned issue. Please ask to be assigned an existing issue or create your own before opening a PR. Read our Contributing Guidelines in the CONTRIBUTING.md file for more details. Thank you for your contribution!"

.github/workflows/community-issue-comment.yml

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+# This workflow handles issue comments.
+
+name: Issue Assignee Comment
+
+on:
+  issues:
+    types:
+      - assigned
+      - labeled
+
+jobs:
+  # When issues are assigned, a comment is posted
+  # Tags the assignee with links to helpful resources
+  # See for more info: https://github.com/actions/github-script
+  assigned-comment:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Post assignee issue comment
+        id: assigned-comment
+        uses: actions/github-script@v7
+        with:
+          github-token: ${{secrets.GITHUB_TOKEN}}
+          script: |
+            github.rest.issues.createComment({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: context.payload.issue.number,
+              body: `Thank you @${context.payload.issue.assignee.login} you have been assigned this issue!
+              **Please follow the directions in our [Contributing Guide](https://github.com/chaynHQ/.github/blob/main/docs/CONTRIBUTING.md). We look forward to reviewing your pull request shortly ✨**
+              
+              ---
+              
+              Support Chayn's mission? ⭐ Please star this repo to help us find more contributors like you!
+              Learn more about Chayn [here](https://linktr.ee/chayn) and [explore our projects](https://org.chayn.co/projects). 🌸`
+              })

.github/workflows/community-stale-management.yml

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+# This workflow labels stale issues and PRs after 30 days of inactivity.
+# Stale PRs are closed after 1 week of inactivity after labeled stale.
+# See for more info: https://github.com/actions/stale
+
+name: Mark Stale Contributions
+
+on:
+  # Enable manual run from the Actions tab so workflow can be run at any time
+  workflow_dispatch:
+  # Scheduled to run at 12:00 on every Monday
+  schedule:
+    - cron: "0 0 * * MON"
+
+jobs:
+  stale:
+    runs-on: ubuntu-latest
+    permissions:
+      issues: write
+      pull-requests: write
+
+    steps:
+      - uses: actions/stale@v9
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+          stale-label: "stale"
+          days-before-stale: 30
+          # disables closing issues
+          days-before-issue-close: -1
+          # close pr after 1 week no updates after stale warning
+          days-before-pr-close: 7
+          # only scan assigned issues
+          include-only-assigned: true
+          # ignore issues assigned to staff and bots
+          exempt-assignees: "kyleecodes, swetha-charles, eleanorreem, annarhughes, tarebyte, dependabot[bot], dependabot, github-actions[bot], github-actions"
+          # disable removing stale label due to irrelevant activity (like branch updates)
+          remove-stale-when-updated: false
+          # exempt dependabot prs from going stale
+          exempt-pr-labels: dependencies
+          # disable counting irrelevant activity (branch updates) towards day counter on prs.
+          ignore-pr-updates: true
+          stale-pr-message: "As per Chayn policy, after 30 days of inactivity, we will close this PR."
+          close-pr-message: "This PR has been closed due to inactivity."
+          stale-issue-message: "As per Chayn policy, after 30 days of inactivity, we will be unassigning this issue. Please comment to stay assigned."