Update issue templates (#47)

.github/ISSUE_TEMPLATE/config.yml

@@ -2,4 +2,4 @@ blank_issues_enabled: false
 contact_links:
   - name: PyMC Discourse
     url: https://discourse.pymc.io/
-    about: Ask usage questions about PyMC or PyTensor
+    about: Ask installation usage questions about PyTensor

.github/ISSUE_TEMPLATE/developer.yml

+name: Developer issue
+description: This template is for developers only!
+
+body:
+- type: textarea
+  attributes:
+    label: Description
+  validations:
+    required: true

.github/ISSUE_TEMPLATE/documentation.yml

@@ -18,8 +18,6 @@ body:
       referring to. You can also check the development version of the
       documentation and see if this issue has already been addressed at
       https://pytensor.readthedocs.io/en/latest/.
-  validations:
-    required: true
 
 - type: textarea
   attributes:

.github/ISSUE_TEMPLATE/feature-request.yml

@@ -6,7 +6,7 @@
 name: Feature request
 description: Check instructions for submitting your idea on the mailing list first.
 title: "ENH: <Please write a comprehensive title after the 'ENH: ' prefix>"
-labels: [enhancements]
+labels: [feature request]
 
 
 body:
@@ -22,15 +22,6 @@ body:
       Check the [Contributor Guide](https://github.com/pymc-devs/pytensor/blob/main/CONTRIBUTING.md)
       if you need more information.
 
-- type: textarea
-  attributes:
-    label: "Link to a discussion"
-    description: >
-      Link to the discussion about this feature request in
-      [Discussions](https://github.com/pymc-devs/pytensor/discussions)
-  validations:
-    required: true
-
 - type: textarea
   attributes:
     label: "Before"

.github/ISSUE_TEMPLATE/installation.yml

-# This issue template was adapted from the NumPy project
-# under the BSD 3-Clause "New" or "Revised" License.
-# Copyright (c) 2005-2022, NumPy Developers.
-# All rights reserved.
-
-
-name: Post-install/importing issue
-description: Report an issue if you have trouble importing or using PyTensor after installation.
-title: "<Please write a comprehensive title here>"
-labels: [installation]
-
-body:
-- type: textarea
-  attributes:
-    label: "Steps to reproduce:"
-    description: >
-      Please describe the installation method (e.g. building from source,
-      Anaconda, pip), your OS and pytensor/Python version information.
-  validations:
-    required: true
-
-- type: textarea
-  attributes:
-    label: "Error message:"
-    description: >
-      Please include full error message.
-    placeholder: |
-      << Full traceback starting from `Traceback: ...` >>
-    render: shell
-
-- type: textarea
-  attributes:
-    label: "Additional information:"
-    description: Please add any additional information that could help us diagnose the problem better.

.github/ISSUE_TEMPLATE/plain.yml

-name: Miscellaneous
-description: A plain template for issues which do not fall into other categories.
-title: "MISC: <Please write a comprehensive title here>"
-
-body:
-- type: textarea
-  attributes:
-    label: Please describe the purpose of filing this issue
-  validations:
-    required: true