User Roles: Create user roles in frontend for organization admin

[manjitapandey]

Is your feature request related to a problem? Please describe. The roles of organisational admin should be created on the frontend. The credentials are provided for those roles by backend as per now. The tasks may be subdivided as below:

1. On logging on as an organisational admin, One should see the prefilled organisation name (non editable).
2. The New button on manage organisation tab should be removed.
3. Addition of assign project manager field on create project step 1(Ref: design).

Additional context The permissions are specified by the file below: https://docs.google.com/spreadsheets/d/1crWztvXvuewE8Zv-qxbv0t_-eYHUqSlrJQgeto8kmf4/edit#gid=1497569844

related #1068