docs: add anchor links to feature sections in README for easy referencing

[VijayVignesh1]

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• Did you read the contributor guideline, Pull Request section?
• Did you make sure to update the docs?
• Did you write any new necessary tests?

What does this PR do?

Fixes #742

PR review

Added key features submodules as headers to enable permalinks.

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[VijayVignesh1]

@deependujha I've added the submodules as headers to enable permalink. We cannot attach permalinks directly to <details> or <summary> blocks.

[deependujha]

Hi @VijayVignesh1,

The repetitive "Click to expand" phrasing feels a bit clunky and detracts from the overall elegance. What do you think about this cleaner alternative, which embeds a subtle permalink icon directly in the summary?

<details>
  <summary> ✅ <a name="my-custom-anchor"></a> Transform datasets while Streaming <a href="#my-custom-anchor">🔗</a> </summary>
&nbsp;

....

</details>

• Adds a simple, invisible anchor (<a name="slug"></a>).
• At end, add a chain icon (🔗) linked to it via <a href="#slug">.

What do you think about this?

cc: @tchaton @bhimrazy

[bhimrazy]

What do you think about this?

yes @deependujha, this looks good — could be a nice addition for navigation.

[VijayVignesh1]

@deependujha @bhimrazy Done! I was thinking more in terms of hover permalinks, but this one looks compact.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80%. Comparing base (a249a28) to head (a17cb01).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@         Coverage Diff         @@
##           main   #743   +/-   ##
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  Coverage    80%    80%           
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  Files        52     52           
  Lines      7331   7331           
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  Hits       5873   5873           
  Misses     1458   1458           

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[deependujha]

looks great to me. Feature can be verified in the pr branch.

[bhimrazy]

LGTM too — let’s see what @tchaton says.