chore(site): Upgrade to MUI v5 (#7437)

site/src/components/TemplateExampleCard/TemplateExampleCard.tsx

@@ -1,4 +1,4 @@
-import { makeStyles } from "@material-ui/core/styles"
+import { makeStyles } from "@mui/styles"
 import { TemplateExample } from "api/typesGenerated"
 import { FC } from "react"
 import { Link } from "react-router-dom"
@@ -68,7 +68,6 @@ const useStyles = makeStyles((theme) => ({
     padding: theme.spacing(2, 2, 2, 0),
     display: "flex",
     flexDirection: "column",
-    gap: theme.spacing(0.5),
     overflow: "hidden",
   },