Unable to add new skills when creating or editing a job

[Kathenae]

Describe the bug
The issue is that when creating or editing a job, users cannot add new skills to the job, they are limited to a pre-existing list.

Steps to reproduce the behavior:

1. Start the development server and Login
2. Click on 'Create Job'
3. Scroll to the input of the skills
4. Type in a name for a new skill, for example, 'Front-end'
5. See that there is no way of adding this new skill.

Expected behavior

1. Users should be able to add new skills to the job, not only from a pre-existing list.
2. The system should allow users to create new skills on the fly while creating or editing the job.
3. The new skills should be saved and available for future use in other jobs.

This way, users would be able to manage their jobs as they want and the system would be completer and more useful for them.