server : update json snippets in README.md [no ci]

[danbev]

This commit updates some of JSON snippets in README.md file and
removes the json language tag from the code blocks.

The motivation for this changes is that if there is invalid json in a
code snippet these are highlighted in red which can make it somewhat
difficult to read and can be a little distracting. This can be seen here

[ngxson]

IMO we should not mark this as javascript because they are definitely not a valid javascript either.

On github, invalid javascript may not render as invalid syntax (highlighted in red), but will do somewhere else.

So the best way is to simply remove the json, so it will become a plain text.

[isaac-mcfadyen]

As an alternative proposal, we could switch the language tag to jsonc and then put anything we know is invalid (as seen from that link) in comments.

Current

[
  {
    "index": 0,
    "embedding": [
      [ ... embeddings for token 0   ... ],
      [ ... embeddings for token 1   ... ],
      [ ... ]
      [ ... embeddings for token N-1 ... ],
    ]
  },
  ...
  {
    "index": P,
    "embedding": [
      [ ... embeddings for token 0   ... ],
      [ ... embeddings for token 1   ... ],
      [ ... ]
      [ ... embeddings for token N-1 ... ],
    ]
  }
]

New

[
  {
    "index": 0,
    "embedding": [
      // [ ... embeddings for token 0   ... ],
      // [ ... embeddings for token 1   ... ],
      // [ ... ]
      // [ ... embeddings for token N-1 ... ],
    ]
  },
  // ...
  {
    "index": "P",
    "embedding": [
      // [ ... embeddings for token 0   ... ],
      // [ ... embeddings for token 1   ... ],
      // [ ... ]
      // [ ... embeddings for token N-1 ... ],
    ]
  }
]

[danbev]

@isaac-mcfadyen Thanks for the suggestion about json with comments! I'll opt on the side of caution and not use a language tag to avoid any rendering issues if jsonc is not supported by a particular render. But feel free to open a PR if you feel strongly about this.