Remove nested .gitignore from openQA rpm

The removed .gitignore should not end up in the production and the openQA
build warns about it.

Author: b10n1k

.gitignore

@@ -46,3 +46,5 @@ node_modules
 openqa-documentation.html
 docs/build/
 docs/vendor/
+# docs
+**/openqa-in-5-minutes.gif