[GRASS-git] [OSGeo/grass] 973fcf: docs: update outdated trac URLs to GitHub (#4317)

[Markus Neteler]

  Branch: refs/heads/releasebranch_8_4
  Home:   https://github.com/OSGeo/grass
  Commit: 973fcfbfc9388775eccb850dc5e1a420d05d467a
      https://github.com/OSGeo/grass/commit/973fcfbfc9388775eccb850dc5e1a420d05d467a
  Author: Markus Neteler <neteler at osgeo.org>
  Date:   2024-09-18 (Wed, 18 Sep 2024)

  Changed paths:
    M .github/labeler.yml
    R CHANGES
    M INSTALL.md
    M Makefile
    R NEWS
    M README.md
    M SECURITY.md
    M general/g.parser/g.parser.html
    M gui/wxpython/gui_core/pyedit.py
    M rpm/grass.spec

  Log Message:
  -----------
  docs: update outdated trac URLs to GitHub (#4317)

Several documents and files contain references to documents on https://trac.osgeo.org/grass/wiki/ while newer versions exist in GitHub. This PR updates a series of URLs and drops the outdated files `CHANGES` and `NEWS`.
Additionally, some minor markdown fixes.



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