docs: Rename tas.md to time-allocation-survey.md and update contents
- Replace placeholder 'service_name'
- Improve table formatting
- Amend 'TDB' to 'TBD'
- Capitalise role names in final section
- Remove extraneous 'The' before service name
- Link both the Gitlab Group and Projects in summary table
- Update 'Technologies Used' table
- Summarise & link to new Ansible deployment process