Add edit beer post, 500 page, and redirectIfLoggedIn getServerSideProps.

Implement edit beer post functionality.

Register, edit and create beer post forms are now using the same layout found in components/ui/forms/BeerPostFormPageLayout. All forms are now extracted into their own components and are now found in components.

Added redirectIfLoggedIn getServerSidesProp fn for login and register pages.

components/ui/forms/Button.tsx

@@ -14,7 +14,7 @@ const Button: FunctionComponent<FormButtonProps> = ({
   // eslint-disable-next-line react/button-has-type
   <button
     type={type}
-    className={`btn btn-primary mt-4 w-full rounded-xl ${isSubmitting ? 'loading' : ''}`}
+    className={`btn-primary btn w-full rounded-xl ${isSubmitting ? 'loading' : ''}`}
   >
     {children}
   </button>