dev(ci): replace add-to-project workflow

Ref: doomemacs/ci@f2a2ad43f1

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -2,6 +2,7 @@
 name: 📝 Bug Report
 description: Report something that isn't working as intended
 labels: ["is:bug", "needs-triage"]
+projects: ["doomemacs/2"]
 body:
 - type: markdown
   attributes:

.github/workflows/add-to-project.yml

@@ -1,8 +0,0 @@
-name: Add issues to project
-on:
-  issues:
-    types: [opened]
-jobs:
-  add-to-project:
-    uses: doomemacs/ci/.github/workflows/add-to-project.yml@legacy
-    secrets: inherit