refactor(services): remove groupby service as this is not longer used

This service was replaced by incorporating it into the `insliceof` filter
style(disorder-page): style the external identifiers section
Release v0.3.3
style(disorder-page): a bit more styling of the external idenfitiers
Release v0.3.4
feat(disorder-model, disorder-page): add shorthand for type of inheritance

Autosomal dominant and autosomal recessive are replaced with 'AD' and 'AR' respectively.
style(disorder-page): move disorder meta-info on top of description.
fix(disorder-page): fix classification title not highlighting purple on hover
style(disorder-card): change disorder icon colour to grey