[TCLCORE] ttrek repositories are now open to the public

[Neophytos D. <neo...@gm...>]

ttrek is an ongoing effort to develop a package manager for TCL extensions
and TCL itself.

ttrek client: https://github.com/jerily/ttrek
registry and website: https://github.com/jerily/ttrek.sh

Note that these projects are still under active development. We are opening
up their git repositories today (2024-07-23) under a permissive license
(MIT) for two reasons: (a) so that people can follow our progress, and (b)
to give a chance to whoever wants to build a better registry or website to
be able to do it.

Our own registry and website will be published to a domain once it is good
and ready.

Take care,
Neophytos