chore: gnoweb rework & QoL

[gfanton]

This PR slightly reorganizes gnoweb to maintain cleanliness due to cumulative changes in the package:

• Use package.json for versioning and keep it in the tools folder.
• Separate the RPC client from rendering, as the client was responsible for rendering as well, which made manipulation at the handler level difficult.
• Update and fix comments and messages.
• Fix development dependencies in the makefile.
• Add basic caching for assets

[Gno2D2]

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Changes related to gnoweb must be reviewed by its codeowners

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└── 🟢 And
    ├── 🟢 The base branch matches this pattern: ^master$
    └── 🟢 A changed file matches this pattern: ^gno.land/pkg/gnoweb/ (filename: gno.land/pkg/gnoweb/.gitattributes)

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    │       ├── 🟢 Pull request author is user: gfanton
    │       └── 🟢 This user reviewed pull request: alexiscolin (with state "APPROVED")
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[codecov[bot]]

Codecov Report

Attention: Patch coverage is 77.90698% with 114 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
gno.land/pkg/gnoweb/client.go	77.27%	25 Missing and 5 partials :warning:
gno.land/pkg/gnoweb/client_mock.go	79.06%	13 Missing and 5 partials :warning:
gno.land/pkg/gnoweb/render.go	71.69%	10 Missing and 5 partials :warning:
gno.land/pkg/gnoweb/handler_http.go	85.36%	8 Missing and 4 partials :warning:
gno.land/pkg/gnoweb/app.go	76.92%	6 Missing and 3 partials :warning:
gno.land/pkg/gnoweb/cache.go	47.05%	8 Missing and 1 partial :warning:
gno.land/cmd/gnoweb/main.go	0.00%	7 Missing :warning:
gno.land/pkg/gnoweb/render_config.go	85.71%	3 Missing and 1 partial :warning:
gno.land/pkg/gnoweb/static.go	84.61%	2 Missing and 2 partials :warning:
gno.land/pkg/gnoweb/status.go	50.00%	2 Missing and 1 partial :warning:
... and 1 more

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