app: Add messages to warm any Incompatible browser

Fixes #639

app/index.html

@@ -43,6 +43,25 @@
 </head>
 
 <body>
+	<noscript>
+		<!--
+			This will be displayed if the user doesn't have JavaScript enabled. 	
+		-->
+		LLDAP requires JavaScript, please switch to a compatible browser or enable 
+		it.
+	</noscript>
+
+	<script>
+		/* Detect if the user has WASM support. */
+		if (typeof WebAssembly === 'undefined') {
+			const pWASMMsg = document.createElement("p")
+			pWASMMsg.innerHTML = `
+			LLDAP requires WASM and JIT for JavaScript, please switch to a 
+			compatible browser or enable it.
+			`
+			document.body.appendChild(pWASMMsg)
+		}
+	</script>
 </body>
 
 </html>