Add link to forum in issue template (#2070)

.github/issue_template.md

@@ -1,6 +1,6 @@
 1. Please speak English, this is the language all of us can speak and write.
-2. Please ask questions or configuration/deploy problems on our Discord server: https://discord.gg/NsatcWJ
-3. Please take a moment to search check that your issue doesn't already exist.
+2. Please ask questions or configuration/deploy problems on our Discord server (https://discord.gg/NsatcWJ) or forum (https://discourse.gitea.io).
+3. Please take a moment to check that your issue doesn't already exist.
 4. Please give all relevant information below for bug reports, because incomplete details will be handled as an invalid report.
 
 **You MUST delete the content above including this line before posting, otherwise your issue will be invalid.**