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.