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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[aeddi]

Quick pre-review, that's really cool that you separated the HTML renderer from the RPC client. 👍