Small-small-hr

Clean up emails: https://github.com/moshthepitt/small-small-hr/pull/23

- Add support for "free days": https://github.com/moshthepitt/small-small-hr/pull/22
- Add support for leave oversubscription: https://github.com/moshthepitt/small-small-hr/pull/21

Better leave days calculations

- Add emails

Increase max staff document file size

Bugfixes