chore: replace broken links with correct ones

(cherry picked from commit 11be07086f)

.github/ISSUE_TEMPLATE/bug_report.yaml

@@ -9,7 +9,7 @@ body:
         Welcome to ERPNext issue tracker! Before creating an issue, please heed the following:
 
         1. This tracker should only be used to report bugs and request features / enhancements to ERPNext
-            - For questions and general support, checkout the [user manual](https://docs.erpnext.com/) or use [forum](https://discuss.erpnext.com)
+            - For questions and general support, checkout the [user manual](https://docs.erpnext.com/) or use [forum](https://discuss.frappe.io/c/erpnext/6)
             - For documentation issues, propose edit on [documentation site](https://docs.erpnext.com/) directly.
         2. When making a bug report, make sure you provide all required information. The easier it is for
            maintainers to reproduce, the faster it'll be fixed.

.github/ISSUE_TEMPLATE/config.yml

@@ -1,5 +1,5 @@
 blank_issues_enabled: false
 contact_links:
   - name: Community Forum
-    url: https://discuss.erpnext.com/
+    url: https://discuss.frappe.io/c/erpnext/6
     about: For general QnA, discussions and community help.

.github/ISSUE_TEMPLATE/feature_request.md

@@ -11,7 +11,7 @@ assignees: ''
 Welcome to ERPNext issue tracker! Before creating an issue, please heed the following:
 
 1. This tracker should only be used to report bugs and request features / enhancements to ERPNext
-    - For questions and general support, checkout the manual https://erpnext.com/docs/user/manual/en or use https://discuss.erpnext.com
+    - For questions and general support, checkout the manual https://docs.erpnext.com or use https://discuss.frappe.io/c/erpnext/6
 2. Use the search function before creating a new issue. Duplicates will be closed and directed to
    the original discussion.
 3. When making a feature request, make sure to be as verbose as possible. The better you convey your message, the greater the drive to make it happen.
@@ -21,7 +21,7 @@ Please keep in mind that we get many many requests and we can't possibly work on
 
 If you're in urgent need to a feature, please try the following channels to get paid developments done quickly:
 1. Certified ERPNext partners: https://erpnext.com/partners 
-2. Developer community on ERPNext forums: https://discuss.erpnext.com/c/developers/5 
+2. Developer community on ERPNext forums: https://discuss.frappe.io/c/framework/5  
 3. Telegram group for ERPNext/Frappe development work: https://t.me/erpnext_opps 
 
 -->