feat(anaconda): integrate anaconda installer with openbox and add licensing documentation

Add Anaconda installer integration to FWS live environment:

- Implement Anaconda launcher in .xinitrc with comprehensive error logging and debugging support
- Add anaconda and anaconda-widgets packages to baseline and releng ISO configs
- Fix anaconda-widgets PKGBUILD: replace gladeui with glib2-devel, disable Glade module
- Update anaconda PKGBUILD with improved dependencies and build configuration
- Add python-blivet PKGBUILD with detailed dependency documentation

Enhance documentation and branding:

- Expand AUTHORS.rst to clarify FWS vs archiso authorship and licensing
- Update CONTRIBUTING.rst with inbound=outbound licensing policy and DCO requirements
- Extend README.md with comprehensive legal basis table and licensing checklist
- Remove Arch Linux references from MOTD and update to FWS GitHub project page
- Fix fastfetch.sh to avoid read-only variable conflict in zsh
- Add xterm to packages for installer debugging

All changes maintain GPL-3.0-or-later compliance and improve GPL offer transparency.

CONTRIBUTING.rst

@@ -2,8 +2,29 @@
 Contributing
 ============
 
-These are the contribution guidelines for archiso.
-All contributions fall under the terms of the GPL-3.0-or-later (see `LICENSE <LICENSE>`_).
+These are the contribution guidelines for **FWS**. FWS is a fork of `archiso
+<https://gitlab.archlinux.org/archlinux/archiso>`_; the build-system parts
+derived from archiso retain their original history and authorship (see
+`AUTHORS.rst <AUTHORS.rst>`_).
+
+Licensing of contributions (inbound = outbound)
+===============================================
+
+All contributions are accepted under the **same license as the project**,
+``GPL-3.0-or-later`` (see `LICENSE <LICENSE>`_). By submitting a contribution you
+agree that it is licensed under ``GPL-3.0-or-later`` and that you have the right
+to submit it under that license.
+
+Sign off every commit to certify the `Developer Certificate of Origin 1.1
+<https://developercertificate.org/>`_:
+
+  .. code:: bash
+
+    git commit --signoff   # adds a "Signed-off-by: Name <email>" trailer
+
+For the full licensing, third-party and trademark picture, see `LICENSING.md
+<LICENSING.md>`_, `THIRD-PARTY-LICENSES.md <THIRD-PARTY-LICENSES.md>`_ and
+`TRADEMARKS.md <TRADEMARKS.md>`_.
 
 Editorconfig
 ============