Fix: file-manager and swarm-desktop bugs (#714)

- drive capacity display with stamp polling
- download/upload progress handling
- overlay and tooltip issues
- FileMaganger readme
- ultra-light mode handling
- account feed view page
- download media files
- remove not found syncing link
- fix ultra light node wallet page
- tooltip issues
---------
Co-authored-by: Andrei Mitrea <andrei.mitrea.hq@gmail.com>
Co-authored-by: nidishk <nidishkrishnan45@gmail.com>
Co-authored-by: Ferenc Sárai <sarai.ferenc@gmail.com>
Co-authored-by: Nándor Komlódi <nandor.komlodi@gmail.com>
Co-authored-by: rolandlor <33499567+rolandlor@users.noreply.github.com>

src/pages/not-found/PageNotFound.tsx

@@ -0,0 +1,14 @@
+import { ReactElement } from 'react'
+import { HistoryHeader } from '../../components/HistoryHeader'
+import { Typography } from '@material-ui/core'
+
+export default function PageNotFound(): ReactElement {
+  return (
+    <div>
+      <HistoryHeader>Page not found</HistoryHeader>
+      <Typography>
+        The given url is invalid. Please go back or <a href="/">navigate to Home screen.</a>
+      </Typography>
+    </div>
+  )
+}