latex, pdftex, tex, texdoc, texliveonfly, tlmgr: add page (#5294)

pages/common/pdftex.md

@@ -0,0 +1,16 @@
+# pdftex
+
+> Compile a PDF document from TeX source files.
+> More information: <https://www.tug.org/applications/pdftex/>.
+
+- Compile a PDF document:
+
+`pdftex {{source.tex}}`
+
+- Compile a PDF document, specifying an output directory:
+
+`pdftex -output-directory={{path/to/directory}} {{source.tex}}`
+
+- Compile a PDF document, halting on each error:
+
+`pdftex -halt-on-error {{source.tex}}`