added shadcn + file organizing

[jpnsantoss]

Closes #

I installed and did the basic setup of shadcn, being already easily used within the project. It's still missing customization in terms of the default colors. I also created the folder $lib/components where the components for the app should be places. shad-cn components will be under $lib/components/ui.

The documentation for shadcn is in here: https://www.shadcn-svelte.com/

Screenshots

Review checklist

• [ ] Contains enough appropriate tests
• [x] Behavior is as expected
• [x] Clean, well-structured code

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (b820ff3) 95.21% compared to head (69ff1cf) 95.21%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #274 +/- ## ======================================== Coverage 95.21% 95.21% ======================================== Files 20 20 Lines 188 188 Branches 38 38 ======================================== Hits 179 179 Misses 9 9 ```

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[LuisDuarte1]

Closed in favor of #281, because of different project structure