refactor(gnoweb): improve layouts and reduce code duplication

[alexiscolin]

This PR aims to improve the HTML composability of gnoweb and avoid DRY issues across templates and layouts. The changes include:

• Refactoring HTML components for better reusability.
• Reducing code duplication in views.
• Removing static data from the layout
• Enhancing code maintainability and readability.

[Gno2D2]

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[codecov]

Codecov Report

Attention: Patch coverage is 89.14729% with 28 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
gno.land/pkg/gnoweb/handler.go	73.33%	11 Missing and 1 partial ⚠️
gno.land/pkg/gnoweb/components/template.go	62.50%	3 Missing and 3 partials ⚠️
gno.land/pkg/gnoweb/components/view.go	75.00%	2 Missing and 1 partial ⚠️
gno.land/pkg/gnoweb/components/view_help.go	91.89%	2 Missing and 1 partial ⚠️
gno.land/pkg/gnoweb/app.go	0.00%	2 Missing ⚠️
gno.land/pkg/gnoweb/components/layout_header.go	94.11%	2 Missing ⚠️

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[gfanton]

LGTM 👍

[gfanton]

LGTM 👍