fix(contribs/gnodev/pkg/emitter): use html/template not text/template for HTML generation

[odeke-em]

This change uses html/template instead of text/template for HTML generation and also locks in tests to detect such subtle regressions and thus help prevent future cross-side scripting (XSS) attacks if later the scripts evolve and take in user input.

Fixes #3544

[Gno2D2]

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[thehowl]

Please address the comment and any other CI errors, and we should be good to go. Thanks!

[odeke-em]

Done and thank you @thehowl

[kristovatlas]

Thank you for the contribution.