update pori demo link destination

[elewis2]

Copied from comment by @mathieulemieux :

While reviewing pori demo docs, I saw these two links:

• pori/docs/demo.md

  Line 3 in df616ca

  A live demo of the platform is found under `pori-demo.bcgsc.ca`. This demo was deployed via docker-compose.

• pori/docs/graphkb/index.md

  Line 51 in df616ca

  The simplest way to try out GraphKB is via the demo we provide [here](https://pori-demo.bcgsc.ca/).

  
  from which we are being redirected to the docs on GH and find it a bit confusing. What about removing them or changing them for the /ipr and /graphkb routes?

Originally posted by @mathieulemieux in #59 (comment)

[mathieulemieux]

See @creisle reply here: #59 (comment)