Adjust getting started section to new config format

Fix docs menu titles and homepage jumbotron.

Set HTML title to current page's title

Add MySQL and CouchDB exporters.

Remove comment about hash collisions

Change config docs to YAML, adjust to changes.

Fix typo.

Fix examples: comments start with #, not //

See https://github.com/prometheus/prometheus/issues/683

Fix rule_checker example

-ruleFile doesn’t exist, and the existing -rule-file flag is deprecated in https://github.com/prometheus/prometheus/commit/c4e762adbf6ee7f8fd24af8dc584a64d14974a7e

Update information about binary releases.

Add README.md to make the generated repository point here.

Fixes prometheus/prometheus.github.io#2.

Fix typo.

Document Grafana integration.

Mention more third-party exporters and integrations.

Updated doc for prometheus/prometheus#649 docker image refactoring PR

Add blog post with the various online posts we're aware of.

Exclude Boxever wrapup, as we're already listing all those posts.

Signed-off-by: Steve Durrheimer <s.durrheimer@gmail.com>

[WIP] Add initial blog code.

This is based roughly on

  http://clarkdave.net/2012/02/building-a-static-blog-with-nanoc/

with a lot of small modifications to make it fit the existing docs site.

Blog posts should be added as:

    content/blog/YYYY-MM-DD-post-title.md

They need to state the title, kind, created_at, and author in the
frontmatter, e.g.:

    ---
    title: "This is a blog post title"
    created_at: 2015-04-22
    kind: article
    author: Julius Volz
    ---

Add docs for stddev and stdvar.

Add sqrt() function