Fix popovers, detail page title, and urls to the repo

* Add a container to the popovers so that they don't inherit the header
styling of their parents
* Update the title of the file page to use the short filename
* Update the path to the plato project
Merge pull request #45 from es-analysis/popover-container

Add container property to popovers, update detail page title, update urls to the plato repo