fix(gnoweb): titles missing id and toc anchors

[alexiscolin]

Fixes issues related to the table of contents in gnoweb (realms). The links were not working because the id attributes were not automatically generated by Goldmark using WithAutoHeadingID. The issue occurred because NewDefaultHTMLWebClientConfig, which initializes this feature, was no longer being used.

[alexiscolin]

@gfanton You might want to consider using NewDefaultHTMLWebClientConfig again, though.

[Gno2D2]

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[codecov]

Codecov Report

Attention: Patch coverage is 70.76923% with 19 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
gno.land/pkg/gnoweb/webclient_html.go	73.68%	10 Missing and 5 partials ⚠️
gno.land/pkg/gnoweb/app.go	50.00%	3 Missing and 1 partial ⚠️

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[gfanton]

@alexiscolin i've applied some changes and a test to avoid regression directly on your branch: alexiscolin#1