update templates (#234)

Author: lkstrp

.github/ISSUE_TEMPLATE/bug_report.yaml

@@ -1,13 +1,14 @@
 name: Bug Report
 description: Create a report if something doesn't work quite right.
-labels: ["bug", "needs triage"]
+labels: ["needs triage"]
+type: "Bug"
 
 body:
 - type: markdown
   attributes:
     value: |
       Thanks for taking the time to fill out this bug report!
-      Please do not post usage questions here. Ask them on the [PyPSA mailing list](https://groups.google.com/forum/#!forum/pypsa).
+      Please do not post usage questions here. Ask them on the [PyPSA Discord server](https://discord.gg/AnuJBk23FU).
 
 - type: checkboxes
   id: checks

.github/ISSUE_TEMPLATE/config.yml

@@ -1,13 +1,5 @@
 blank_issues_enabled: true
 contact_links:
-- name: Discord Server
+- name: PyPSA Discord server
   url: https://discord.gg/AnuJBk23FU
-  about: To discuss with other PyPSA users, organise projects, share news, and get in touch with the community.
-
-- name: PyPSA Mailing List
-  url: https://groups.google.com/forum/#!forum/pypsa
   about: Please ask and answer general usage questions here.
-
-- name: Stackoverflow
-  url: https://stackoverflow.com/questions/tagged/pypsa
-  about: Please ask and answer code-related questions here.

.github/ISSUE_TEMPLATE/documentation_improvement.yaml

@@ -1,6 +1,7 @@
 name: Documentation Improvement
 description: Report wrong or missing documentation
-labels: ["documentation", "needs triage"]
+labels: ["needs triage"]
+type: 'Docs'
 
 body:
 - type: textarea

.github/ISSUE_TEMPLATE/feature_request.md

@@ -2,11 +2,14 @@
 name: Feature Request
 about: Suggest an idea for this project
 title: ''
-labels: ["feature", "needs triage"]
+labels: ["needs triage"]
+type: 'Feature'
 assignees: ''
 
 ---
 
+<!-- Please do not post usage questions here. Ask them on the PyPSA Discord server: https://discord.gg/AnuJBk23FU -->
+
 ## Describe the feature you'd like to see
 
 *Please give a clear and concise description and provide context why the feature would be useful.*