Support LN Address

This PR adds support for lightning addresses directly through the opensats website and all functioanlity is handled on the btcpay side, if the LN address is configured as described in OpenSats#8 (comment)

middleware.ts

@@ -0,0 +1,14 @@
+import { NextResponse } from 'next/server';
+import type { NextRequest } from 'next/server';
+
+export function middleware(request: NextRequest) {
+    if(process.env.BTCPAY_URL &&request.nextUrl.pathname.startsWith('/.well-known/lnurlp/')) {
+        //take process.env.BTCPAY_URL and strip the /api/v1/ from it, then take the username being requested and append it to the end
+        const lnAddressEndpoint = `${process.env.BTCPAY_URL.replace('/api/v1/', '')}/.well-known/lnurlp/${request.nextUrl.pathname.replace('/.well-known/lnurlp/', '')}`;
+        return NextResponse.rewrite(lnAddressEndpoint);
+    }
+    // you can even extend this and add nip5 support for each project on opensats, but that requires you to install the Nostr plugin on BTCPay
+}
+export const config = {
+    matcher: '/.well-known/:path+',
+};