docs: update outdated trac URLs to GitHub

CHANGES

@@ -1,7 +1,8 @@
 CHANGES in GRASS GIS 8.x
 
-https://trac.osgeo.org/grass/wiki/Grass8/NewFeatures80
-https://trac.osgeo.org/grass/wiki/Grass8/NewFeatures82
+- https://github.com/OSGeo/grass/tags
+- https://trac.osgeo.org/grass/wiki/Grass8/NewFeatures80
+- https://trac.osgeo.org/grass/wiki/Grass8/NewFeatures82
 
 List of releases:
 

INSTALL.md

@@ -206,7 +206,7 @@ make
 make install
 ```
 
-For details, see <https://trac.osgeo.org/grass/wiki/HowToGit>
+For details, see <https://github.com/OSGeo/grass/blob/main/doc/development/github_guide.md>
 
 ## (H) COMPILING INDIVIDUAL MODULES - OWN MODULES
 
@@ -327,8 +327,10 @@ Please see the README file and the files at:
 
 ## (M) CONTRIBUTING CODE AND PATCHES
 
-Please see ./SUBMITTING in this directory, or better,
-<https://trac.osgeo.org/grass/wiki/Submitting>
+Please see
+
+- <https://github.com/OSGeo/grass/blob/main/doc/development/style_guide.md>
+- <https://github.com/OSGeo/grass/blob/main/doc/development/github_guide.md>
 
 ## Authors
 

NEWS

@@ -1,18 +1,20 @@
 NEWS
 
 GRASS GIS 8
- o https://trac.osgeo.org/grass/wiki/Grass8/NewFeatures80
- o https://trac.osgeo.org/grass/wiki/Grass8/NewFeatures82
+ - https://github.com/OSGeo/grass/tags
+ - https://trac.osgeo.org/grass/wiki/Grass8/NewFeatures80
+ - https://trac.osgeo.org/grass/wiki/Grass8/NewFeatures82
 
 GRASS GIS 7
- o https://trac.osgeo.org/grass/wiki/Grass7/NewFeatures78
- o https://trac.osgeo.org/grass/wiki/Grass7/NewFeatures76
- o https://trac.osgeo.org/grass/wiki/Grass7/NewFeatures74
- o https://trac.osgeo.org/grass/wiki/Grass7/NewFeatures72
- o https://trac.osgeo.org/grass/wiki/Grass7/NewFeatures
+ - https://trac.osgeo.org/grass/wiki/Grass7/NewFeatures78
+ - https://trac.osgeo.org/grass/wiki/Grass7/NewFeatures76
+ - https://trac.osgeo.org/grass/wiki/Grass7/NewFeatures74
+ - https://trac.osgeo.org/grass/wiki/Grass7/NewFeatures72
+ - https://trac.osgeo.org/grass/wiki/Grass7/NewFeatures
 
  List of releases
- o https://trac.osgeo.org/grass/wiki/Release
+ - https://github.com/OSGeo/grass/releases (GRASS GIS 7 and later)
+ - https://trac.osgeo.org/grass/wiki/Release (full list)
 
 GRASS GIS 1-6
- o List of older releases, starting in 1984 (!), see https://grass.osgeo.org/about/history/releases/
+ - List of older releases, starting in 1984 (!), see https://grass.osgeo.org/about/history/releases/

README.md

@@ -34,7 +34,7 @@ GRASS GIS. See [CONTRIBUTING file](CONTRIBUTING.md) for more details.
 How to get write access here
 
 Want to become a core developer? See
-[Procedure for gaining Git write access](https://trac.osgeo.org/grass/wiki/HowToContribute#WriteaccesstotheGRASScorerepository)
+[Contributing](https://github.com/OSGeo/grass/blob/main/CONTRIBUTING.md)
 
 ## How to compile GRASS
 

SECURITY.md

@@ -25,7 +25,7 @@ vulnerability, please follow these steps:
 
 ## Supported Versions
 
-Please refer to our [Release Schedule](https://trac.osgeo.org/grass/wiki/Release/Schedule)
+Please refer to our [Roadmap](https://grass.osgeo.org/about/roadmap/)
 for details on which versions are currently supported.
 
 ## Security Measures

general/g.parser/g.parser.html

@@ -673,7 +673,7 @@ <h2>SEE ALSO</h2>
 <p>
 Overview table: <a href="parser_standard_options.html">Parser standard options</a>
 <p>
-<a href="http://trac.osgeo.org/grass/wiki/Submitting/Python">Submitting rules for Python</a>
+<a href="https://github.com/OSGeo/grass/blob/main/doc/development/style_guide.md#python">Submitting rules for Python</a>
 
 <p>
 Related Wiki pages:

gui/wxpython/gui_core/pyedit.py

@@ -634,10 +634,14 @@ def OnModulesHelp(self, event):
         self.giface.Help("full_index")
 
     def OnSubmittingHelp(self, event):
-        open_url("https://trac.osgeo.org/grass/wiki/Submitting/Python")
+        open_url(
+            "https://github.com/OSGeo/grass/blob/main/doc/development/style_guide.md#python"  # noqa: E501
+        )
 
     def OnAddonsHelp(self, event):
-        open_url("https://grass.osgeo.org/development/code-submission/")
+        open_url(
+            "https://github.com/OSGeo/grass/blob/main/doc/development/style_guide.md#developing-grass-addons"  # noqa: E501
+        )
 
     def OnSupport(self, event):
         open_url("https://grass.osgeo.org/support/")