Use forum.gitea.com instead of old URL (#31989)

.github/ISSUE_TEMPLATE/bug-report.yaml

@@ -11,7 +11,7 @@ body:
       value: |
         1. Please speak English, this is the language all maintainers can speak and write.
         2. Please ask questions or configuration/deploy problems on our Discord
-           server (https://discord.gg/gitea) or forum (https://discourse.gitea.io).
+           server (https://discord.gg/gitea) or forum (https://forum.gitea.com).
         3. Make sure you are using the latest release and
            take a moment to check that your issue hasn't been reported before.
         4. Make sure it's not mentioned in the FAQ (https://docs.gitea.com/help/faq)

.github/ISSUE_TEMPLATE/config.yml

@@ -7,7 +7,7 @@ contact_links:
     url: https://discord.gg/Gitea
     about: Please ask questions and discuss configuration or deployment problems here.
   - name: Discourse Forum
-    url: https://discourse.gitea.io
+    url: https://forum.gitea.com
     about: Questions and configuration or deployment problems can also be discussed on our forum.
   - name: Frequently Asked Questions
     url: https://docs.gitea.com/help/faq

.github/ISSUE_TEMPLATE/feature-request.yaml

@@ -7,7 +7,7 @@ body:
       value: |
         1. Please speak English, this is the language all maintainers can speak and write.
         2. Please ask questions or configuration/deploy problems on our Discord
-           server (https://discord.gg/gitea) or forum (https://discourse.gitea.io).
+           server (https://discord.gg/gitea) or forum (https://forum.gitea.com).
         3. Please take a moment to check that your feature hasn't already been suggested.
   - type: textarea
     id: description

.github/ISSUE_TEMPLATE/ui.bug-report.yaml

@@ -11,7 +11,7 @@ body:
       value: |
         1. Please speak English, this is the language all maintainers can speak and write.
         2. Please ask questions or configuration/deploy problems on our Discord
-           server (https://discord.gg/gitea) or forum (https://discourse.gitea.io).
+           server (https://discord.gg/gitea) or forum (https://forum.gitea.com).
         3. Please take a moment to check that your issue doesn't already exist.
         4. Make sure it's not mentioned in the FAQ (https://docs.gitea.com/help/faq)
         5. Please give all relevant information below for bug reports, because