feat: self-contained and improved ssi dive log tool

[webbertakken]

Changes

• The QR code API that I was using no longer worked. It suddenly stopped functioning. Got an email from one of the people using the Garmin to SSI divelog helper tool that it was no longer functional.
• Replaced external API by an in-page image generator that can no longer suddenly break.
• Added a few images to show how the process works
• Added a few words about users also being able to upload .zip files containing .fit files directly
• The parsing happens so fast that sometimes it can be hard to see whether you successfully moved away from the previous dive onto the next. This is now fixed using a toast message, that will show when the QR code changes.
• Made it a tad more mobile friendly

Checklist

• Read the contribution guide and accept the
  code of conduct
• Readme (updated or not needed)
• Tests (added, updated or not needed)

[pr-code-reviewer]

👋 Hi there!

Everything looks good!

_{^{Automatically generated with the help of gpt-3.5-turbo.
Feedback? Please don't hesitate to drop me an email at webber@takken.io.}}

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