Update .gitattributes

Update .gitattributes - GitHub lingusit vendoring

Update: .gitattributes - vendoring (linguist)

Update .gitattributes: GitHub Linguist vendoring

Update .gitattributes

Add .deepsource.toml

Update README.md: Add link to GitLab mirror.

README.md: Add NotABug.org/reduce-algebra mirror.

README.md: %s/Reduce/**REDUCE**/g: Capitalization.

multi: Fixup SECURITY.md; add Markdown README.md.

Update .gitattributes: Use explicit paths

Add .gitattributes: Disable GitHub linguist

Add SECURITY.md: Redirect to Sourceforge project.

Remove mistaken-pull-closer.yml, using mergable.

Add .github/.mergeable.yml: Automatically close PRs

Add .github/issue-close-app.yml: Redirect issues.

Add .github/mistaken-pull-closer.yml/autoclose PRs

Updating .gitignore

Add Reduce 3.0 to the historical section of the archive, and some more
files relating to version sof PSL from the early 1980s. Thanks are due to
Paul McJones and Nelson Beebe for these, as well as to all the original
authors.


git-svn-id: https://svn.code.sf.net/p/reduce-algebra/code/historical@5328 2bfe0521-f11c-4a00-b80e-6202646ff360

Commit two tar.gz files with PSL sources and binaries for "old" architectures.
Courtesy of Winfried Neun (ZIB Berlin).


git-svn-id: https://svn.code.sf.net/p/reduce-algebra/code/historical@4918 2bfe0521-f11c-4a00-b80e-6202646ff360