Remove the bats tests

That was interesting but finally not so useful. We will make better
tests in Go. The hard part will be to make them working in CI/CD.

.gitmodules

@@ -1,9 +0,0 @@
-[submodule "test/bats"]
-	path = test/bats
-	url = https://github.com/bats-core/bats-core.git
-[submodule "test/test_helper/bats-support"]
-	path = test/test_helper/bats-support
-	url = https://github.com/bats-core/bats-support.git
-[submodule "test/test_helper/bats-assert"]
-	path = test/test_helper/bats-assert
-	url = https://github.com/bats-core/bats-assert.git

test/examples.bats

@@ -1,9 +0,0 @@
-@test "generating and linting examples" {
-    for d in $(find ../examples/ -maxdepth 1 -mindepth 1 -type d); do
-        pushd $d
-        rm -rf chart
-        go run ../../cmd/katenary convert -f
-        helm lint chart
-        popd
-    done
-}