fix: update connector links and streamline icon components

- Changed Linkup API link from linkup.ai to linkup.so in the connector popup.
- Removed unused IconSparkles and replaced it with Luma SVG in the connector icons.
- Updated image properties for Linear, GitHub, Google Calendar, Google Gmail, and Google Drive connectors to ensure consistent sizing.
- Replaced old SVG files for GitHub, Google Calendar, Google Drive, Google Gmail, and Linear with new versions for improved visuals.

surfsense_web/components/assistant-ui/connector-popup/connect-forms/components/linkup-api-connect-form.tsx

@@ -79,12 +79,12 @@ export const LinkupApiConnectForm: FC<ConnectFormProps> = ({
 					<AlertDescription className="text-[10px] sm:text-xs !pl-0">
 						You'll need a Linkup API key to use this connector. You can get one by signing up at{" "}
 						<a
-							href="https://linkup.ai"
+							href="https://linkup.so"
 							target="_blank"
 							rel="noopener noreferrer"
 							className="font-medium underline underline-offset-4"
 						>
-							linkup.ai
+							linkup.so
 						</a>
 					</AlertDescription>
 				</div>