Customise home page, add policies (#68)

* initial login.html

* add Pangeo text

* fix links

* add style

* simplify

* simplify

* start over

* simplify

* test image

* reorder folders

* reorder folders

* test new path

* test new path

* delete test folder

* add text back

* remove spacer-sm

* add missing <p> tag

* fix <a> tag

* add new logos

* add new logos

* add new logos

* add new logos

* add new logos

* add pp and aup

* EGI style

* EGI style

* EGI style

* add pp and aup

* add pp and aup

* change path to policies

* update pp

* update pp

* update pp

* update aup

* update aup

* update login

* update login

* update login

* update login

* update login

* update login

* update login

* update login

* update login

* update login

* update login

* update login

* update login

* update login

* update logo in pp

* update logo in pp

* update logo in pp

* update logo in pp and aup

* update logo in pp and aup

* add style to pp

* add style to pp and aup

* add style to pp and aup

* add style to pp and aup

* update pangeo logo

* update pangeo logo

* update link to hub

* test importing css

* test importing css

* test importing css

* Revert "test importing css"

This reverts commit af46350.

* Revert "update link to hub"

This reverts commit ae96c3a.

* importing css didn't work