feat(frontend): updates to latest mantine attributes

Pending adaption to breaking changes for element attributes since
changed within existing components. Adjustments to `ta`, `gap`, `fw`,
etc.

services/frontend/src/pages/Home.tsx

@@ -7,7 +7,7 @@ const Homepage = () => {
     <Container mt='xl'>
       <Title>Feed</Title>
       <Divider my='md' variant='dotted' />
-      <Stack my='lg' spacing='md'>
+      <Stack my='lg' gap='md'>
         <HomePostFeed />
       </Stack>
     </Container>