Docs: Update links to HTTPS

[SainathPoojary]

Related: #68883
Related to: #68882

What?

Updated all hardcoded HTTP links in the codebase to use HTTPS where applicable.

Why?

Ensuring links use HTTPS improves security by encrypting data transmission, aligns with modern web standards, and prevents potential mixed content warnings on HTTPS-enabled sites. This update addresses outdated HTTP links to enhance user trust and data protection.

How?

• Searched the codebase for all instances of http:// links.
• Verified whether the corresponding HTTPS versions of the links are valid and accessible.
• Replaced all valid http:// links with https:// equivalents.
• Skipped any links that do not support HTTPS or are intentionally left as HTTP.

Testing Instructions

1. Review the modified files to confirm all instances of http:// links have been appropriately replaced with https://.
2. Verify that the replaced links are functional by navigating to them in a browser.
3. Check for any unintended consequences (e.g., broken URLs or incorrect replacements) in the impacted files.

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Co-authored-by: SainathPoojary <sainathpoojary@git.wordpress.org>
Co-authored-by: t-hamano <wildworks@git.wordpress.org>
Co-authored-by: shail-mehta <shailu25@git.wordpress.org>

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[shail-mehta]

@SainathPoojary Thanks for the PR.

I think Its Not Follow up of #68883 its Related PR.

[t-hamano]

Thanks for the PR!

Some links have redirects applied to them so I think we need to write the final URL.

[SainathPoojary]

Hey @t-hamano,

I’ve made all the suggested changes and added a few additional improvements. Please have a look whenever you have a moment. Thanks for the review!

[t-hamano]

LGTM 👍