UX/UI Improvements

[mariemkallel16]

Tasks :

Zoom on the node object is too large during initial creation #117
Application Module - Front-end improvements
#282 (added explanation for the module + link to documentation + better show casing of the options)
Added directions in the hompage (link to testing phase as a example to try out for beginners)
Added introductions to all pages with links to documentation
Replaced string entry options with list options with better and more accurate tooltips
Updated some of the options for regression and classification parameters

[MahdiAll99]

Finished testing the changes, here are my comments:

• The text and the links are very clear 😃
• General comment: I think we can directly say in our documentation (instead of in our Gitbook documentation)
• I think the testing phase part will confuse users (to discuss)
• Home page issue: we still see recent workspaces after setting a workspace (will be automatically fixed after merging so no changes to be made)
• For links: using tag opens links within MEDomicsLab, it's better to open them in the user's default browser by using shell.openExternal("url"). For example:
  <a href="https://medomics-udes.gitbook.io/medomicslab-docs/medomicslab-docs-v0/tutorials" target="_blank" rel="noopener noreferrer" style={{ color: "#0056b3", textDecoration: "none", marginLeft: "5px" }}> MEDomicsLab Documentation </a>
  will become:
  <a><u onClick={() => {shell.openExternal("https://medomics-udes.gitbook.io/medomicslab-docs/medomicslab-docs-v0/tutorials")}} target="_blank" rel="noopener noreferrer" style={{ color: "#0056b3", textDecoration: "none", marginLeft: "5px" }}> MEDomicsLab Documentation </u></a>
• For learning module nodes, I think it would be more accurate to change nodes' URLs to "https://medomics-udes.gitbook.io/medomicslab-docs/tutorials/development/learning-module#id-1.-available-nodes"
• Missing documentation link for Evaluation Module