GitHub: Add text to readme and the issue template to record macros for bugs (#15761)

* Add text to readme and the issue template that the user should record a macro when recreating the issue and sharing this macro in the issue.
Updated old links from master branch to main.

.github/ISSUE_TEMPLATE/PROBLEM_REPORT.yml

@@ -1,12 +1,12 @@
 name: Report a Problem
 description: Have you found something that does not work well, is too hard to do or is missing altogether? Please create a Problem Report.
-labels: ["needs triage"]
+labels: ["Status: Needs triage"]
 body:
   - type: checkboxes
     id: existing_issue
     attributes:
       label: Is there an existing issue for this?
-      description: Please search to see if an issue already exists for the problem you encountered.
+      description: Please [search](https://github.com/FreeCAD/FreeCAD/issues) to see if a similar issue already exists for the problem you encountered.
       options:
       - label: I have searched the existing issues
         required: true
@@ -14,7 +14,7 @@ body:
     id: description
     attributes:
       label: Problem description
-      description: Describe the problem and how it impacts user experience, workflow, maintainability or speed of the code. If the problem appears to be a bug with the current functionality, provide as test case or recipe that reproduces the error.
+      description: Describe the problem and how it impacts user experience, workflow, maintainability or speed of the code. If the problem appears to be a bug with the current functionality, provide as test case or recipe that reproduces the error. Ideally record a macro and attach it.
       placeholder: Description of the problem
     validations:
       required: true
@@ -33,14 +33,13 @@ body:
       options:
         - Addon Manager
         - Assembly
-        - BIM/Arch
-        - CAM/Path
+        - BIM
+        - CAM
         - Core
         - Draft
         - Expressions
         - FEM
         - File formats
-        - GCS
         - Mesh
         - OpenSCAD
         - Part
@@ -48,7 +47,7 @@ body:
         - Project Tools & Websites
         - Sketcher
         - Spreadsheet
-        - Techdraw
+        - TechDraw
         - Other (specify in description)
   - type: textarea
     id: anything_else
@@ -57,6 +56,7 @@ body:
       description: |
         Links? References? Anything that will give us more context about the issue you are encountering!
         If there is a discussion about the problem on the forum, provide link(s) here.
+        You can upload or copy your macro here to speed up the diagnosis and debugging.
 
         Tip: You can attach images or log files by clicking this area to highlight it and then dragging files in. To attach a FCStd file, ZIP it first (GitHub won't recognize the extension otherwise).
     validations:
@@ -65,7 +65,7 @@ body:
     id: terms
     attributes:
       label: Code of Conduct
-      description: By submitting this issue, you agree to follow our [Code of Conduct](https://github.com/FreeCAD/FreeCAD/blob/master/CODE_OF_CONDUCT.md)
+      description: By submitting this issue, you agree to follow our [Code of Conduct](https://github.com/FreeCAD/FreeCAD/blob/main/CODE_OF_CONDUCT.md)
       options:
         - label: I agree to follow this project's Code of Conduct
           required: true