feat(gnoweb): In gnoweb help, add QR code for the tx link

[jefft0]

The gnoweb help screen already has a tx link for the realm function. We add a popup QR code with the same link.

• In gnoweb/components registerHelpFuncs, add buildHelpQR which returns a base64 of the QR code
• Run make tidy. (This affects go.mod in other folders like gnobro.)
• In help_function.html, add the QR code

This is a draft proof of concept. We still need:

• Decide if github.com/boombuler/barcode is a good QR code package
• Make the QR code appear in a popup window. (Button next to the tx link icon)
• Make the QR code update when the tx link changes

[Gno2D2]

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[gfanton]

super nice, cc @alexiscolin

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