chore: migrate issue and PR templates to Gitea format

Also add metadata to the issues and the PR template.

GitLab doesn't use file-based configuration for the PR template,
so the template is added here.

See https://docs.gitea.io/en-us/issue-pull-request-templates/

.gitea/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,15 @@
+# Description
+
+Please write down a clear and concise description of this Merge Request.
+
+# Closes
+
+Please write down the issues that this MR closes.
+
+# Implementation Insight
+
+Please write down how did you implement this in a clear and concise manner.
+
+# TO-DOs
+
+A list of TO-DOs of things you have did before the MR is undrafted.

.gitea/issue_templates/Bug.md

@@ -1,3 +1,15 @@
+---
+
+name: Bug Report
+about: Report a bug affecting Echidna Code Editor
+title: bug: 
+ref: main
+labels:
+
+- bug
+- help needed
+---
+
 ## Description
 
 Please write a clear and concise description of the issue you are getting.

.gitea/issue_templates/Feature Request.md

@@ -1,3 +1,15 @@
+---
+
+name: Feature Request
+about: Request a new feature or support that can be implemented into Echidna.
+title: "feat: "
+ref: main
+labels:
+
+- enhancement
+
+---
+
 ## Description
 
 Please write a clear and concise description of the issue you are getting.