OpenID provider URL should be configurable

[vikoivun]

kaavapino-ui/src/utils/userManager.js

Line 14 in a3ec8de

authority: 'https://api.hel.fi/sso/openid/',

kaavapino-ui/src/sagas/apiSaga.js

Line 54 in a3ec8de

const data = yield apiUtils.get('https://api.hel.fi/sso/api-tokens/')

Please make these configurable as REACT_APP_OPENID_ENDPOINT. The URL part 'https://api.hel.fi/sso' should be taken from the env var. Rest should stay hardcoded ('/openid/' and '/api-tokens' respectively).