(integrations restructure) add deployment folder (#3912)

* added deployment sub-folder and updated links

* added redirectsand other fixes

* fixed more instances of BitBucket

Author: imatwawana

src/docs/product/integrations/heroku/heroku-config.png renamed to src/docs/product/integrations/deployment/heroku/heroku-config.png

@@ -1,9 +1,10 @@
 ---
 title: Heroku
-sidebar_order: 101
+sidebar_order: 1
 redirect_from:
   - /workflow/integrations/heroku/
   - /workflow/integrations/legacy-integrations/gitlab/
+  - /product/integrations/heroku/
 description: "Learn more about Sentry's Heroku integration."
 ---
 

src/docs/product/integrations/heroku/heroku-configure-repo-integration.png renamed to src/docs/product/integrations/deployment/heroku/heroku-configure-repo-integration.png

@@ -0,0 +1,13 @@
+---
+title: Deployment
+sidebar_order: 50
+description: "Learn more about Sentry's deployment integrations."
+---
+
+Learn more about Sentry's deployment integrations:
+
+- [Bitbucket Pipelines](/product/releases/setup/release-automation/bitbucket-pipelines/)
+- [GitHub Actions](/product/releases/setup/release-automation/github-actions/)
+- [Heroku](/product/integrations/deployment/heroku/)
+- [Netlify](/product/releases/setup/release-automation/netlify/)
+- [Vercel](/product/integrations/deployment/vercel/)

src/docs/product/integrations/heroku/heroku-integration-detail.png renamed to src/docs/product/integrations/deployment/heroku/heroku-integration-detail.png

@@ -1,9 +1,10 @@
 ---
 title: Vercel
-sidebar_order: 101
+sidebar_order: 1
 redirect_from:
   - /workflow/integrations/vercel/
   - /workflow/integrations/global-integrations/vercel/
+  - /product/integrations/vercel/
 description: "Learn more about Sentry's Vercel integration and how you can connect your Sentry and Vercel projects to automatically upload source maps and notify Sentry of release deployment."
 ---