[Frontend] - Develop extension interface

[garciagenrique]

Develop the extension interface using React.

• [Frontend] - Finalise login tab #33
• [Frontend] - Develop search tab allowing basic zenodo searches #34
• [Frontend] - Improve Search tab with the possibility of searching records and communities #36
• [Frontend] - Improve Search tab making it interactive by displaying content of the select record when clicking on it #37
• [Frontend] Upload functionality from the extension #42
• [Backend] Download files in the jupyterlab local storage #43