Updated the Lucid vesting app.

[nkarl]

In this PR, I did the following:

1. Update the dependencies of the Lucid vesting app.
   • Updated lucid-cardano to version 0.10.10 since previous version breaks with security concern.
   • Updated Webpack config so that students should use a local .env file to set their own Blockfrost project Id for this app. Added a README to instruct students on this step.
2. Removed and refactored unneeded files and logic.
   • Removed the static bootstrap CSS file because it can now be pulled as a dependency.
   • Removed the date-time-picker because it is natively supported by modern browsers via datetime-local.
   • Refactored the logic of the app; separated many actions for better clarity (single responsibility).