add nvim, restructure zsh

zsh/config.d/go.zsh

@@ -0,0 +1,9 @@
+# GO stuff
+export GOPATH="${HOME}/go"
+#export GOROOT="$(brew --prefix golang)/libexec"
+export GOROOT="/usr/local/go"
+export PATH=${GOPATH}/bin:${GOROOT}/bin:$PATH
+export GOPRIVATE="github.com/solo-io"
+export ACK_GINKGO_DEPRECATIONS=1.16.5
+export GOLANG_PROTOBUF_REGISTRATION_CONFLICT=warn
+