Feat select input files and workspace path

[brnovasco]

This pr resolves #3.

1. Add new base ui components needed for the file navigation component ("nautilus");
2. Create component for rendering remote file navigation based on an "ls-like" api response;
3. Add component as form input for image, label, superpixel, annotation file paths and output dir path to the new instance form;
4. Create api route performing ls via ssh;
5. Refactor job script template for creating env variables based on the new form fields and passing it to the container environment on runtime;
6. Refactor api route for submitting the job with the new fields replacing the associated variables in the script template;

Requires changes in the .env file.

[brnovasco]

New navigation input field requested for "class model" file. Waiting for tests with new container.

[brnovasco]

Hi, @RafaelLyra8! Thanks for the review! I think the merge was still blocked because our team was not assigned as maintainer for this repo. I think I solved this now. I also took the opportunity to solve other small issue related to error messages breaking the layout of the form when I presented these changes in our last meeting.