Removed Kafka Binding doc and its references

[CodesbyUnnati]

Fixes #5682

Proposed Changes

• Have removed the outdated Readme.md file of Kafka Binding.
• Removed the reference of Kafka Binding from docs/sample/eventing.md file

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: CodesbyUnnati / name: Unnati Mishra (7a508dd)

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[knative-prow]

Welcome @CodesbyUnnati! It looks like this is your first PR to knative/docs 🎉

[pierDipi]

Thanks @CodesbyUnnati

[CodesbyUnnati]

Hi @csantanapr @pmbanugo Can you please review this PR 😄

[pierDipi]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: CodesbyUnnati, pierDipi

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• OWNERS [pierDipi]

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[pierDipi]

/cherry-pick release-1.11

[pierDipi]

/cherry-pick release-1.10

[knative-prow-robot]

@pierDipi: #5684 failed to apply on top of branch "release-1.11":

Applying: Removed Kafka Binding doc and its references
Using index info to reconstruct a base tree...
M	code-samples/eventing/kafka/binding/README.md
Falling back to patching base and 3-way merge...
CONFLICT (modify/delete): code-samples/eventing/kafka/binding/README.md deleted in Removed Kafka Binding doc and its references and modified in HEAD. Version HEAD of code-samples/eventing/kafka/binding/README.md left in tree.
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0001 Removed Kafka Binding doc and its references
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".

In response to this:

/cherry-pick release-1.11

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[knative-prow-robot]

@pierDipi: #5684 failed to apply on top of branch "release-1.10":

Applying: Removed Kafka Binding doc and its references
Using index info to reconstruct a base tree...
M	code-samples/eventing/kafka/binding/README.md
Falling back to patching base and 3-way merge...
CONFLICT (modify/delete): code-samples/eventing/kafka/binding/README.md deleted in Removed Kafka Binding doc and its references and modified in HEAD. Version HEAD of code-samples/eventing/kafka/binding/README.md left in tree.
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0001 Removed Kafka Binding doc and its references
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".

In response to this:

/cherry-pick release-1.10

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.