Makefile: mv codespell config to .codespellrc

It is cleaner that way.

While at it, let's try to minimize it.

[NO NEW TESTS NEEDED]

Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>

.codespellrc

@@ -0,0 +1,3 @@
+[codespell]
+skip = ./vendor,./.git,./go.sum,./docs/*.1,./docker/AUTHORS,./CHANGELOG.md,./changelog.txt,./tests/tools/vendor,./tests/tools/go.mod,./tests/tools/go.sum
+ignore-words-list = fo,passt,secon,erro

Makefile

@@ -120,7 +120,7 @@ docs: install.tools ## build the docs on the host
 	$(MAKE) -C docs
 
 codespell:
-	codespell -S Makefile,buildah.spec.rpkg,AUTHORS,bin,vendor,.git,go.mod,go.sum,CHANGELOG.md,changelog.txt,seccomp.json,.cirrus.yml,"*.xz,*.gz,*.tar,*.tgz,*ico,*.png,*.1,*.5,*.orig,*.rej" -L secon,passt,bu,uint,iff,od,erro -w
+	codespell -w
 
 .PHONY: validate
 validate: install.tools