Fix: "Compiled with warnings." message when compiling the code for the first time

[SantiagoJimenezQ]

This pr solves the following issue: #2

Description:
When compiling the code for the first time, the compiler shows a warning ¨Compiled with warnings.¨.
For local development this is not a problem, but when trying to deploy it to "Vercel", it will not accept a build with warnings, which can cause some friction to new users.

Compiled with warnings.

./src/App.js
  Line 2:10:  'ethers' is defined but never used                                                                                          no-unused-vars
  Line 15:9:  Emojis should be wrapped in <span>, have role="img", and have an accessible description with aria-label or aria-labelledby  jsx-a11y/accessible-emoji

Fixes:

• The line that imports "ethers" is now commented out.
• The "waving hand" emoji is now wrapped in a 'span'.
• Some minor changes due to ESLint automatic formatting.