Implement confirm user functionality

This commit adds the necessary functionality to confirm a user's account.

It includes the addition of a new column in the user table to track whether an account is confirmed or not, and the implementation of JWT for confirmation tokens.

This commit integrates the SparkPost API as well as React Email to send dynamic emails for whatever purpose.

Upon user registration, a confirmation email will be sent to the user.

components/BeerById/BeerInfoHeader.tsx

@@ -59,7 +59,7 @@ const BeerInfoHeader: FC<{ beerPost: BeerPostQueryResult; initialLikeCount: numb
               <div className="tooltip tooltip-left" data-tip={`Edit '${beerPost.name}'`}>
                 <Link
                   href={`/beers/${beerPost.id}/edit`}
-                  className="btn btn-outline btn-sm"
+                  className="btn-outline btn-sm btn"
                 >
                   <FaRegEdit className="text-xl" />
                 </Link>