Support uploading USB-setup bundle from onboarding

[jcapona]

Status	Ticket/Issue
Ready	Ticket

Main changes

• Update first page of the onboarding to allow user to select if they're a teacher or a home user.
• If they're a user, they're prompted to upload a setup-file to configure and update their device.

Also, this new 'selection' page of the onboarding is skipped if we detect that the user is onboarding on the device (using a display and keyboard) or if the pi-top doesn't have an internet connection; in this case, they're redirected to the language page.

Screenshots (feature, test output, profiling, dev tools etc)

Other notes (e.g. implementation quirks, edge cases, questions / issues)

Manual testing tips

Tag anyone who definitely needs to review or help

[codecov-commenter]

Codecov Report

Patch coverage: 73.43% and project coverage change: +0.10 🎉

Comparison is base (fed230c) 69.16% compared to head (0e0c89d) 69.26%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #430      +/-   ##
==========================================
+ Coverage   69.16%   69.26%   +0.10%     
==========================================
  Files         182      189       +7     
  Lines        3467     3589     +122     
  Branches      153      173      +20     
==========================================
+ Hits         2398     2486      +88     
- Misses        941      961      +20     
- Partials      128      142      +14     

Flag	Coverage Δ
js-tests	75.63% <82.52%> (+0.56%)	⬆️
python-tests	66.15% <36.00%> (-0.35%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
frontend/src/Root.tsx	0.00% <ø> (ø)
frontend/src/pages/languagePage/LanguagePage.tsx	80.00% <ø> (ø)
frontend/src/services/postFile.ts	0.00% <0.00%> (ø)
pt_os_web_portal/backend/routes.py	84.86% <27.27%> (-3.16%)	⬇️
frontend/src/components/onboarding_app/App.tsx	89.13% <50.00%> (-1.99%)	⬇️
frontend/src/components/optionCard/OptionCard.tsx	66.66% <66.66%> (ø)
frontend/src/components/upload/Upload.tsx	75.00% <75.00%> (ø)
frontend/src/components/choice/Choice.tsx	80.00% <80.00%> (ø)
...rontend/src/components/upload/utils/fileUpload.tsx	82.75% <82.75%> (ø)
frontend/src/pages/splashPage/SplashPage.tsx	84.21% <83.33%> (-15.79%)	⬇️
... and 4 more

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