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/BeerPostFormPageLayout.tsx

@@ -0,0 +1,28 @@
+import { ReactNode, FC } from 'react';
+import { IconType } from 'react-icons';
+
+interface FormPageLayoutProps {
+  children: ReactNode;
+  headingText: string;
+  headingIcon: IconType;
+}
+
+const FormPageLayout: FC<FormPageLayoutProps> = ({
+  children: FormComponent,
+  headingIcon,
+  headingText,
+}) => {
+  return (
+    <div className="align-center my-20 flex h-fit flex-col items-center justify-center">
+      <div className="w-8/12">
+        <div className="my-4 flex flex-col items-center space-y-1">
+          {headingIcon({ className: 'text-4xl' })}
+          <h1 className="text-3xl font-bold">{headingText}</h1>
+        </div>
+        <div>{FormComponent}</div>
+      </div>
+    </div>
+  );
+};
+
+export default FormPageLayout;