Refactor GitHub Integration (#6713)

* fix: refactor

* fix: tests

* fix: apply octokit plugin pattern

package.json

@@ -67,6 +67,7 @@
     "@hocuspocus/server": "1.1.2",
     "@joplin/turndown-plugin-gfm": "^1.0.49",
     "@juggle/resize-observer": "^3.4.0",
+    "@octokit/auth-app": "^6.0.4",
     "@outlinewiki/koa-passport": "^4.2.1",
     "@outlinewiki/passport-azure-ad-oauth2": "^0.1.0",
     "@renderlesskit/react": "^0.11.0",
@@ -149,8 +150,8 @@
     "natural-sort": "^1.0.0",
     "node-fetch": "2.7.0",
     "nodemailer": "^6.9.9",
-    "outline-icons": "^3.2.1",
     "octokit": "^3.1.2",
+    "outline-icons": "^3.2.1",
     "oy-vey": "^0.12.1",
     "passport": "^0.7.0",
     "passport-google-oauth2": "^0.2.0",