latexpand: add page (#15311)

* latexpand: add page

* Update latexpand.md

* Update pages/common/latexpand.md

Co-authored-by: Wiktor Perskawiec <git@spageektti.cc>

---------

Co-authored-by: Wiktor Perskawiec <git@spageektti.cc>

pages/common/latexpand.md

@@ -0,0 +1,24 @@
+# latexpand
+
+> Simplify LaTeX source files by removing comments and resolving `\include`s, `\input`s, etc.
+> More information: <https://www.ctan.org/pkg/latexpand>.
+
+- Simplify the specified source file and save the result to the specified [o]utput file:
+
+`latexpand --output {{path/to/output.tex}} {{path/to/file.tex}}`
+
+- Do not remove comments:
+
+`latexpand --keep-comments --output {{path/to/output.tex}} {{path/to/file.tex}}`
+
+- Do not expand `\include`s, `\input`s etc.:
+
+`latexpand --keep-includes --output {{path/to/output.tex}} {{path/to/file.tex}}`
+
+- Expand `\usepackage`s as far as the corresponding STY files can be found:
+
+`latexpand --expand-usepackage --output {{path/to/output.tex}} {{path/to/file.tex}}`
+
+- Inline the specified BBL file:
+
+`latexpand --expand-bbl {{path/to/bibliography.bbl}} --output {{path/to/output.tex}} {{path/to/file.tex}}`