Revert "Gitignore LaTeX temp files."

This reverts commit bc8e2d15.
We already ignore those in the tex folders. We don't want global ignores for them.

.gitignore

@@ -19,12 +19,3 @@ Makefile.coq
 Makefile.coq.conf
 *.crashcoqide
 .env
-*.bbl
-*.bcf
-*.blg
-*.log
-*.out
-*.pdf
-*.run.xml
-*.toc
-