replace references to GitHub in header and footer

client/components/Footer.tsx

@@ -32,7 +32,7 @@ const Footer: FC = () => {
           title="Source"
           target="_blank"
         >
-          GitHub
+          Source Code
         </ALink>
         {" | "}
         <ALink href="/terms" title="Terms of Service">

client/components/Header.tsx

@@ -116,10 +116,10 @@ const Header: FC = () => {
           >
             <Li>
               <ALink
-                href="//github.com/jellykells/klip"
+                href="//git.thisisjoes.site/joe/klip"
                 target="_blank"
                 rel="noopener noreferrer"
-                title="GitHub"
+                title="Source Code"
                 fontSize={[14, 16]}
               >
                 GitHub