Remove Vale from the test suite for now

Author: stevepiercy

Makefile

@@ -212,7 +212,7 @@ doctest: deps
 	      "results in $(BUILDDIR)/doctest/output.txt."
 
 .PHONY: test
-test: clean linkcheckbroken vale ## Clean docs build, then run linkcheckbroken and vale
+test: clean linkcheckbroken  ## Clean docs build, then run linkcheckbroken
 
 .PHONY: deploy
 deploy: clean html