bootloaderInstructions: add recovery variant

[dlech]

For official firmware recovery, we have separate videos for non-USB hubs.

Closes: pybricks/support#728

[codecov-commenter]

Codecov Report

Base: 69.58% // Head: 69.51% // Decreases project coverage by -0.07% ⚠️

Coverage data is based on head (91802f7) compared to base (0f871c6).
Patch coverage: 75.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1365      +/-   ##
==========================================
- Coverage   69.58%   69.51%   -0.08%     
==========================================
  Files         189      189              
  Lines        4666     4678      +12     
  Branches      948      959      +11     
==========================================
+ Hits         3247     3252       +5     
- Misses       1402     1407       +5     
- Partials       17       19       +2     

Impacted Files	Coverage Δ
src/app/constants.ts	100.00% <ø> (ø)
.../bootloaderInstructions/BootloaderInstructions.tsx	69.84% <73.33%> (-6.16%)	⬇️
...re/restoreOfficialDialog/RestoreOfficialDialog.tsx	100.00% <100.00%> (ø)

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