project: change headings to level 5

https://git.minetest.land/Mineclonia/Mineclonia/pulls/56#issuecomment-22917

.gitea/issue_template/bug-report.md

@@ -8,15 +8,15 @@ labels:
 
 ---
 
-## What happened?
+###### What happened?
 
 <!-- Describe what's wrong. -->
 
-## What did I expect?
+###### What did I expect?
 
 <!-- Describe what should be happening instead -->
 
-## How to get it to happen
+###### How to get it to happen
 
 <!--
 Write down exactly what you did to get the bug to happen
@@ -27,7 +27,7 @@ don't need them all, delete the empty numbers.
 2. 
 3. 
 
-## Environment
+###### Environment
 
 **Mineclonia Version**: <!-- Paste the version of Mineclonia here, if you know it. -->
 

.gitea/issue_template/feature-request.md

@@ -7,10 +7,10 @@ labels:
 
 ---
 
-## Problem
+###### Problem
 
 <!-- Describe what's wrong. -->
 
-## Solution
+###### Solution
 
 <!-- Write down an example of what you'd like to happen. -->

.gitea/pull_request_template.md

@@ -6,7 +6,7 @@ type of banner to mcl_banners, the title should look like:
     items/mcl_banners: add new banner type
 
 -->
-## Problem
+###### Problem
 TRACKING ISSUE: #<!-- Tracking issue number -->
 
 <!--
@@ -15,15 +15,15 @@ If the tracking issue includes all the needed
 information, you can leave this section empty.
 -->
 
-## Solution
+###### Solution
 
 <!-- Describe HOW this pull request solves its problem. -->
 
-## Details
+###### Details
 
 <!-- Include any additional information here. -->
 
-## Testing Steps
+###### Testing Steps
 
 <!--
 Write how we can verify this patch addresses its problem.
@@ -43,7 +43,7 @@ Please remember to put WIP: in front of the title as well.
 -->
 
 <!--
-## To do
+###### To do
 
 - [ ] Item 1
 - [ ] Item 2