feat(gnoweb): add gnoconnect html meta entries

[moul]

Adds before the </head>:

  <meta name="gnoconnect:rpc" content="127.0.0.1:26657" />
  <meta name="gnoconnect:chainid" content="dev" />

Blocks #3610

[Gno2D2]

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📢 Thoughts on this report? Let us know!

[gfanton]

[aeddi]

Cool ! 👍

[leohhhn]

lgtm

Maybe wait before merging to hear back from onbloc?

[notJoon]

LGTM 🚀