feat(skin): add margin skin (11 themes; light/dark per theme; switchable from Settings)

.github/ISSUE_TEMPLATE/bug_report.md

@@ -30,7 +30,8 @@ If applicable, add screenshots to help explain your problem.
  - OS: [e.g., Ubuntu 20.04]
  - Node.js version (`node --version`):
  - npm version (`npm --version`):
- - Is the server free of plugins: 
+ - Is the server free of plugins:
+ - Are you using any abstraction IE docker?
 
 **Desktop (please complete the following information):**
  - OS: [e.g. iOS]

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,7 +1,7 @@
 <!--
 
-1. If you haven't already, please read https://github.com/ether/etherpad-lite/blob/master/CONTRIBUTING.md#pull-requests .
-2. Run all the tests, both front-end and back-end.  (see https://github.com/ether/etherpad-lite/blob/master/CONTRIBUTING.md#testing)
+1. If you haven't already, please read https://github.com/ether/etherpad/blob/master/CONTRIBUTING.md#pull-requests .
+2. Run all the tests, both front-end and back-end.  (see https://github.com/ether/etherpad/blob/master/CONTRIBUTING.md#testing)
 3. Keep business logic and validation on the server-side.
 4. Update documentation.
 5. Write `fixes #XXXX` in your comment to auto-close an issue.