Set descriptive front page title
Set descriptive front page title

The title of the homepage is used in Google search results.

du2016/prometheus-docs,pdbogen/docs,Cepave/openfalcon.io,open-falcon/open-falcon.github.io,prometheus/docs,Cepave/openfalcon.io,prometheus/docs,tcolgate/docs,chosenken/docs,open-falcon/open-falcon.github.io,ddfreyne/prometheus-docs,chosenken/docs,ddfreyne/prometheus-docs,du2016/prometheus-docs,Cepave/openfalcon.io,prometheus/docs,tcolgate/docs,tcolgate/docs,du2016/prometheus-docs,pdbogen/docs,chosenken/docs,pdbogen/docs,open-falcon/open-falcon.github.io,ddfreyne/prometheus-docs,chosenken/docs,ddfreyne/prometheus-docs