latexdiff: add page (#8509)

pages/common/latexdiff.md

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+# latexdiff
+
+> Determine differences between two LaTeX files.
+> More information: <https://ctan.org/pkg/latexdiff>.
+
+- Determine changes between different versions of a LaTeX file (the resulting LaTeX file can be compiled to show differences underlined):
+
+`latexdiff {{old.tex}} {{new.tex}} > {{diff.tex}}`
+
+- Determine changes between different versions of a LaTeX file by highlighting differences in boldface:
+
+`latexdiff --type=BOLD {{old.tex}} {{new.tex}} > {{diff.tex}}`
+
+- Determine changes between different versions of a LaTeX file, and display minor changes in equations with both added and deleted graphics:
+
+`latexdiff --math-markup=fine --graphics-markup=both {{old.tex}} {{new.tex}} > {{diff.tex}}`