remove netlify preview build

Signed-off-by: Daniel Holbach <daniel@weave.works>

.gitignore

@@ -65,6 +65,3 @@ prog/externalui/externalui.go
 client/build-pkg
 client/bundle
 client/.yarnrc
-
-# Website
-site-build

Makefile

@@ -251,14 +251,3 @@ deps:
 	$(GO) get -u -f \
 		github.com/mattn/goveralls \
 		github.com/2opremio/trifles/wscat
-
-# This target is only intended for use in Netlify CI environment for generating preview pages on feature branches and pull requests.
-# We need to obtain website repository (checked out under `site-build`) and place `site` directory into the context (`site-build/_weave_net_docs`).
-# We then run make in `site-build` and Netlify will publish the output (`site-build/_site`).
-netlify-site-preview:
-	@mkdir -p site-build
-	@curl --user $(WEBSITE_GITHUB_USER) --silent 'https://codeload.github.com/weaveworks/website-next/tar.gz/$(WEBSITE_BRANCH)' \
-	  | tar --extract --gunzip --directory site-build --strip 1
-	@cp -r site site-build/_weave_scope_docs
-	@$(MAKE) -C site-build netlify_ensure_install
-	@$(MAKE) -C site-build BUILD_ENV=netlify