Add TeXLive packages for PDF generation from Org-mode and LaTeX documents:
- texlive-latex-base: Core LaTeX packages
- texlive-latex-extra: Additional LaTeX packages
- texlive-fonts-recommended: Recommended fonts
- texlive-xetex: XeTeX engine for Unicode support
- texlive-science: Science/math packages
This is PR 3 of 5 for Docker package additions.
Depends on PR #10 and #11.
