[GRASS-git] [OSGeo/grass] c17346: Rename the master branch to main (#1806)

[Vaclav Petras]

  Branch: refs/heads/main
  Home:   https://github.com/OSGeo/grass
  Commit: c173461446b5ac99b4aa22aeec6c0bee74659317
      https://github.com/OSGeo/grass/commit/c173461446b5ac99b4aa22aeec6c0bee74659317
  Author: Vaclav Petras <wenzeslaus at gmail.com>
  Date:   2021-08-22 (Sun, 22 Aug 2021)

  Changed paths:
    M .github/workflows/codeql-analysis.yml
    M AUTHORS
    M CONTRIBUTING.md
    M INSTALL
    M README.md
    M display/d.mon/main.c
    M doc/infrastructure.md
    M grasslib.dox
    M gui/wxpython/gmodeler/g.gui.gmodeler.html
    M include/Make/Docs.make
    M mswindows/osgeo4w/setup_x86.hint.tmpl
    M mswindows/osgeo4w/setup_x86_64.hint.tmpl
    M singularity/debian/README_debian.md
    M utils/mkhtml.py

  Log Message:
  -----------
  Rename the master branch to main (#1806)

* Changes master to main in CI and URLs.
* In descriptions and instructions it further changes wording to say branch for more clarity.
* Removes full web URLs when a file path is more appropriate or sufficient.
* In manual page, it refers to Addons overview page instead of the repo.
* Singularity instructions now don't mix the different versions.