FBbi: Fix BioPortal link.

The FBbi ontology is available on BioPortal at the following URI:
https://bioportal.bioontology.org/ontologies/FBbi (note the mixed-case
`FBbi` at the end of the URI).

FBbi's metadata does not include an explicit link to BioPortal, so one
is automatically generated by the website template, but the generated
link is `https://bioportal.bioontology.org/ontologies/FBBI`, which ends
up on a 404 because of the all-uppercase ontology ID.

This commit adds an explicit link to BioPortal, overriding the
automatically generated one.

Author: gouttegd

ontology/fbbi.md

@@ -2,6 +2,10 @@
 layout: ontology_detail
 id: fbbi
 title: Biological Imaging Methods Ontology
+browsers:
+- title: BioPortal Browser
+  label: BioPortal
+  url: https://bioportal.bioontology.org/ontologies/FBbi
 build:
   checkout: git clone https://github.com/foundingGIDE/fbbi.git
   path: .