Remove travis CI remainders

.travis.yml

-sudo: false
-language: ruby
-branches:
-  only:
-  - master
-script: make deploy
-before_install:
-- eval "$(ssh-agent -s)"
-- openssl aes-256-cbc -K $encrypted_2ba894bc7c2f_key -iv $encrypted_2ba894bc7c2f_iv -in prometheus_rsa.enc -out prometheus_rsa -d
-- chmod 600 prometheus_rsa
-- ssh-add prometheus_rsa
-env:
-  global:
-    secure: aNZoB4UDtdelUDxFTTJa5Dxm8gXorKGmQWYaFIXzuBwLvFMp1toIY+amsMrGBbnvxrJosO4764GpS8sWRT/Jbr252sxjOe8N4jfbtJUX29U2aNFQSWVc/o8VnKFW1NI5cjBAZ9OOvgpS6KUGkXZ2/PTmvgxvyqGS4pPovIM1OOo=

Makefile

 DOWNLOADS := prometheus alertmanager blackbox_exporter consul_exporter graphite_exporter haproxy_exporter memcached_exporter mysqld_exporter node_exporter pushgateway statsd_exporter
 
+build: clean downloads compile
+
 clean:
 	rm -rf output downloads repositories
 
 compile:
 	bundle exec nanoc
 
-deploy: clean downloads compile github_pages_export github_pages_push
-
 downloads: $(DOWNLOADS:%=downloads/%/repo.json) $(DOWNLOADS:%=downloads/%/releases.json)
 
 downloads/%/repo.json:
@@ -20,19 +20,4 @@ downloads/%/releases.json:
 	@echo "curl -sf -H 'Accept: application/vnd.github.v3+json' <GITHUB_AUTHENTICATION> https://api.github.com/repos/prometheus/$*/releases > $@"
 	@curl -sf -H 'Accept: application/vnd.github.v3+json' $(GITHUB_AUTHENTICATION) https://api.github.com/repos/prometheus/$*/releases > $@
 
-github_pages_export:
-	cd output && \
-		mkdir -p .github && \
-		echo "This repository is auto-generated. You have to open pull requests against https://github.com/prometheus/docs instead." > .github/PULL_REQUEST_TEMPLATE.md && \
-		echo prometheus.io > CNAME && \
-		git init && \
-		git config user.name "Travis CI" && \
-		git config user.email "travis@prometheus.io" && \
-		git add . && \
-		git commit --message="Static site builder output"
-
-github_pages_push:
-	cd output && \
-	git push -f git@github.com:prometheus/prometheus.github.io master
-
-.PHONY: compile deploy github_pages_export github_pages_push
+.PHONY: build compile deploy

README.md

-# Prometheus Documentation [![Build Status](https://travis-ci.org/prometheus/docs.svg?branch=master)](https://travis-ci.org/prometheus/docs)
+# Prometheus Documentation
 
 This repository contains both the content and the static-site generator code for the
 Prometheus documentation site.
@@ -18,7 +18,7 @@ bundle
 To generate the static site, run:
 
 ```bash
-bundle exec nanoc
+make build
 ```
 
 The resulting static site will be stored in the `output` directory.