Refactor document flow related to add_mandate request

Merge pull request #10 from ArtyomDevNow/PH-643

PH-643 Python rakendus ei tohi nõuda document objekti volituse lisamisel

Improvements

Improvements related changes.

Add logic to add_sub_delegate funciton

Related to ticket: PH-621

API changes

Merge pull request #7 from ArtyomDevNow/PH-609

PH-609 [BUG] sample-provider-python käitub delegate type=LEGAL_PERSON puhul valesti

Add /v1 to beginning of all paths

Changes related to ticket: PH-614

API changes

API requests changes related to tickets PH-609 and PH-573.

Refactored /roles and /mandates requests

Release is related to tickets: PH-145 and PH-596.

v0.1.0

delete by docker-compose generated pg_data