feat: better url validation:

- Do not accept redirects. Usually
	on yt at least, redirect means the link
	is invalid. Hence, it redirects to the home
	page.

	- This is tested and it works well. trust.

Signed-off-by: HeshamTB <hishaminv@gmail.com>

templates/download-result.html

@@ -8,6 +8,6 @@
 <button>Try Again
     <!-- <a class="htmx-indicator" href="#" aria-busy="true"></a> -->
 </button>
-<mark>Internal Error. Try Again later</mark>
+<strong>Internal Error. Try Again later</strong>
 {{ end }}
 </div>

yt.go

@@ -31,7 +31,11 @@ func isValidURL(data string) bool {
     }
 
     
-    httpClient := &http.Client{}
+    httpClient := &http.Client{
+        CheckRedirect: func(req *http.Request, via []*http.Request) error {
+            return http.ErrUseLastResponse
+        },
+    }
     resp, err := httpClient.Get(data)
 
     if err != nil {