Fixing bug where details button was not shown

See merge request !131

GREG-100: Cancel invitation

See merge request !129

GREG-91: Expand sponsor api

See merge request !126

Greg 61 role button

See merge request !124

Fix script for populating db with test data

See merge request !127

Code for guest routes moved to their own folder so that we don't need
multiple api calls.
Serializer class for roles has been simplified with methods for
validation of each field and a separate one used in invites without
requiring the person field.

Resolves: GREG-61

Greg 96 fix build

See merge request !125

Breaks npm build

Issue: GREG-96

Issue: GREG-96

Bump deps

See merge request !122

Adding section on sponsorpage

See merge request !119

Greg 61 Add search field

See merge request !120

Allows search using e-mail and mobile phone, limiting results to 10
first matches

To make handling info about roles and persons easier we split them into
separate objects. The Profile page has now gotten its own api endpoint
where a sponsor has access to all guests instead of only those they are
sponsor for which is used on the sponsor frontpage. This is necessary
since a sponsor may want to give a role to someone they are not
currently sponsor for.

When choosing the Register new guest button, you are now sent to a new
page where you can search for existing guests to prevent creating
duplicates. The page also has a register new guest button that takes you
to the previous version of the page, now located at /register/new

A future commit will make the search field functional.

Code for registering a new guest has been moved to
register/stepRegistration.tsx to make room for multiple routes in
register/index.tsx.