Remove import page back button (#433)

We're removing this because due to the embedded MakeCode messing with history it doesn't work on first click.
No easy fix so better for folks to use browser back where they might be annoyed but will at least probably try again.

Author: microbit-grace

src/pages/ImportPage.tsx

@@ -83,10 +83,6 @@ const ImportPage = () => {
     }
   }, [connStageActions, loadProject, name, navigate, newSession, project]);
 
-  const handleBack = useCallback(() => {
-    navigate(-1);
-  }, [navigate]);
-
   const { saveHex } = useProject();
   const handleSave = useCallback(() => {
     void saveHex();
@@ -144,10 +140,7 @@ const ImportPage = () => {
               onChange={(e) => setName(e.currentTarget.value)}
             />
           </Stack>
-          <HStack pt={5} justifyContent="space-between">
-            <Button variant="ghost" onClick={handleBack} size="lg">
-              <FormattedMessage id="back-action" />
-            </Button>
+          <HStack pt={5} justifyContent="flex-end">
             <Button
               isDisabled={!isValidSetup}
               isLoading={fetchingProject}