provide donation address via env

.env.sample

@@ -1,4 +1,5 @@
 REACT_APP_INFURA_KEY=
 REACT_APP_WC_PROJECT_ID=
 REACT_APP_GITCOIN_GRANTS_ACTIVE=
-REACT_APP_GITCOIN_GRANTS_LINK=
+REACT_APP_GITCOIN_GRANTS_LINK=
+REACT_APP_DONATION_ADDRESS=

.nvmrc

@@ -0,0 +1 @@
+v18.16.1

src/components/Footer.tsx

@@ -64,7 +64,7 @@ function Footer() {
   const handleDonate = async (value: string) => {
     try {
       await sendTransaction({
-        to: "0x63A556c75443b176b5A4078e929e38bEb37a1ff2",
+        to: process.env.REACT_APP_DONATION_ADDRESS!,
         value: parseEther(value),
       });
       launchConfetti();