feat(gnoweb): add hyperlinks to import p/*and r/* in source code viewer

[mous1985]

This PR adds hyperlinks to package and realm imported in the source code viewer on gnoweb.

• Context and Goal:
  When users view source code on gnoweb, they often need to explore dependencies and related code. the goal was to make this easier by making imports linkable for example, when you see import "gno.land/p/demo/avl", you should be able to click it to see that package's source code.

thanks to @gfanton for the help

[Gno2D2]

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[gfanton]

@mous1985 before any reviews, can you add tests, especially testing:

• single one line import import "abc.yx/a/b/c"
• multi import:

import (
                 "abc.yx/a/b/c"
                 "abc.yx/a/b/c"
                 "abc.yx/a/b/c"
)

• named import:

import (
                 hello "abc.yx/a/b/c"
)

• empty named import:

import (
                 _ "abc.yx/a/b/c"
)

thanks

[codecov]

Codecov Report

Attention: Patch coverage is 96.77419% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
gno.land/pkg/gnoweb/webclient_html.go	96.77%	0 Missing and 1 partial ⚠️

📢 Thoughts on this report? Let us know!

[alexiscolin]

Could you please try to use Tailwind and its config theme instead of using a new classes, new colors etc?

[mous1985]

fffb7f4
It's good if i use <a href="/%s$source" class="text-blue-600 hover:underline">&#34;%s&#34;</a> the same color as the original import ?

[mous1985]

• single one line import import "abc.yx/a/b/c"
• multi import:

import (
                 "abc.yx/a/b/c"
                 "abc.yx/a/b/c"
                 "abc.yx/a/b/c"
)

• named import:

import (
                 hello "abc.yx/a/b/c"
)

• empty named import:

import (
                 _ "abc.yx/a/b/c"
)

thanks

@gfanton I've added all the requested test cases in d17d363

• single import
• multiple import
• named import
• empty named import