Show files in a folder structure format

[alexreyes]

For large projects, like uniswapV3, it's confusing to see all these files in the first page.

It would be so much better to see the contracts in the same format as what we see in VSCode

Because in this example, there are actually just 4 uniswap v3 contracts, and lots of contracts written to test them (16 contracts in the test/ folder). This isn't a problem for interface or library contracts bc those are not shown in the front page.