docs: rework the user interface bug report template

* move `id: can-reproduce` to first position to give incentivize reproducers.
  If the description comes first, the person filing the bug report
  will describe the problem in plain English. It is better if the
  first thing they do, if at all possible, is to create a reproducer
  and provide a link.
* remove `id: os-ver` as it has never been relevant.
* do not require `id: forgejo-ver` because it does not matter that much
  as long as it can be reproduced on try.next.
* remove "If the error appears to relate to Forgejo the server" as it
  has never been relevant.
* require the description

.gitea/issue_template/bug-report-ui.yaml

@@ -13,16 +13,29 @@ body:
       - Please speak English, as this is the language all maintainers can speak and write.
       - Be as clear and concise as possible. A very verbose report is harder to interpret in a concrete way.
       - Be civil, and follow the [Forgejo Code of Conduct](https://codeberg.org/forgejo/code-of-conduct).
-      - Please make sure you are using the latest release of Forgejo and take a moment to [check that your issue hasn't been reported before](https://codeberg.org/forgejo/forgejo/issues?q=&type=all&labels=78137).
-      - Please give all relevant information below for bug reports, as incomplete details may result in the issue not being considered.
+      - Take a moment to [check that your issue hasn't been reported before](https://codeberg.org/forgejo/forgejo/issues?q=&type=all&labels=78137).
+- type: dropdown
+  id: can-reproduce
+  attributes:
+    label: Can you reproduce the bug on the Forgejo test instance?
+    description: |
+      Please try reproducing your issue at https://dev.next.forgejo.org.
+      It is running the latest development branch and will confirm the problem is not already fixed.
+      If you can reproduce it, provide a URL in the description.
+    options:
+    - "Yes"
+    - "No"
+  validations:
+    required: true
 - type: textarea
   id: description
   attributes:
     label: Description
     description: |
-      Please provide a description of your issue here, with a URL if you were able to reproduce the issue (see below).
-      If you think this is a JavaScript error, show us the JavaScript console.
-      If the error appears to relate to Forgejo the server, please also give us `DEBUG` level logs. (See https://forgejo.org/docs/latest/admin/logging-documentation/)
+      Please provide a description of your issue here, with a URL if you were able to reproduce the issue (see above).
+      If you think this is a JavaScript error, include a copy of the JavaScript console.
+  validations:
+    required: true
 - type: textarea
   id: screenshots
   attributes:
@@ -35,20 +48,6 @@ body:
   attributes:
     label: Forgejo Version
     description: Forgejo version (or commit reference) your instance is running
-  validations:
-    required: true
-- type: dropdown
-  id: can-reproduce
-  attributes:
-    label: Can you reproduce the bug on Forgejo Next?
-    description: |
-      Please try reproducing your issue at [Forgejo Next](https://next.forgejo.org).
-      If you can reproduce it, please provide a URL in the Description field.
-    options:
-    - "Yes"
-    - "No"
-  validations:
-    required: true
 - type: input
   id: browser-ver
   attributes:
@@ -56,8 +55,3 @@ body:
     description: The browser and version that you are using to access Forgejo
   validations:
     required: true
-- type: input
-  id: os-ver
-  attributes:
-    label: Operating System
-    description: The operating system you are using to access Forgejo