Docs: (EE Port) Merge EE doc/user/project/issues to CE

doc/user/project/issues/create_new_issue.md

@@ -67,7 +67,7 @@ or contacts to continue working._
 
 ## New issue via Service Desk **[PREMIUM]**
 
-Enable [Service Desk](../service_desk.md) to your project and offer email support.
+Enable [Service Desk](https://docs.gitlab.com/ee/user/project/service_desk.html) to your project and offer email support.
 By doing so, when your customer sends a new email, a new issue can be created in
 the appropriate project and followed up from there.
 

doc/user/project/issues/issue_data_and_actions.md

@@ -90,7 +90,7 @@ If a label doesn't exist yet, you can click **Edit**, and it opens a dropdown me
 
 - Assign a weight. Larger values are used to indicate more effort is required to complete the issue. Only positive values or zero are allowed.
 
-Learn more in the [Issue Weight documentation](../../../workflow/issue_weight.md).
+Learn more in the [Issue Weight documentation](https://docs.gitlab.com/ee/workflow/issue_weight.html).
 
 #### 9. Participants
 
@@ -103,7 +103,7 @@ Learn more in the [Issue Weight documentation](../../../workflow/issue_weight.md
 - Unsubscribe: if you are receiving notifications on that issue but no
   longer want to receive them, unsubscribe from it.
 
-Read more in the [notifications documentation](../../../workflow/notifications.md#issue--epics--merge-request-events).
+Read more in the [notifications documentation](https://docs.gitlab.com/ee/workflow/notifications.html#issue--epics--merge-request-events).
 
 #### 11. Reference
 

doc/user/project/issues/related_issues.md

@@ -42,4 +42,4 @@ Additionally, you are also able to manage related issues through [our API].
 [ee]: https://about.gitlab.com/pricing/
 [ee-1797]: https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/1797
 [permissions]: ../../permissions.md
-[Our API]: ../../../api/issue_links.md
+[Our API]: https://docs.gitlab.com/ee/api/issue_links.html