docs: Use install command for kubectl binary on macOS

[rajyavardhan01]

What this PR does / why we need it

This PR updates the kubectl installation documentation for macOS to use the install command instead of separate chmod, mv, and chown commands.

Before (3 commands, 2 steps):

chmod +x ./kubectl
sudo mv ./kubectl /usr/local/bin/kubectl
sudo chown root: /usr/local/bin/kubectl

After (1 command, 1 step):

sudo install -o root -m 0755 ./kubectl /usr/local/bin/kubectl

The install command is cleaner because it:

• Sets executable permissions (-m 0755)
• Sets ownership (-o root)
• Copies the file to destination

All in a single, explicit command.

Which issue(s) this PR fixes

Fixes https://github.com/kubernetes/website/issues/53518 (partial - macOS page only)

Special notes for your reviewer

• This PR only updates the macOS installation page as a starting point
• The same pattern exists in ~35 other files (as noted in the issue)
• If this approach is approved, similar updates can be made to other installation docs

/kind documentation

[k8s-ci-robot]

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[lmktfy]

Not tested (no suitable Mac) but the changes look right to me.

[rajyavardhan01]

Hi can we merge this PR if this is looking good. Thanks!

[rajyavardhan01]

Hi @mikedanese @natalisucks requesting to review this PR and let me know if there is anything needed. Thanks