DOC: Update outdated getting_started links in whatsnew files #63253
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This PR updates several outdated hyperlinks in the documentation that still referenced the old getting_started/install.html page. The Pandas documentation has since reorganized the Getting Started section, and the correct page is now located at getting_started/installation.html.
Summary of changes
Updated all occurrences of getting_started/install.html in the whatsnew/ documentation files to point to getting_started/installation.html.
Corrected the corresponding redirect entry in doc/redirects.csv so that older references route to the correct modern page.
Verified that the remaining occurrences of “getting_started” in other files (CSS references, image paths, and section anchors) were not hyperlinks and therefore did not require modification.
Why this change is needed
Several parts of the documentation contained hard-coded links to pages that no longer exist due to restructuring of the Getting Started section. These outdated URLs:
caused broken links on the live documentation website,
produced unnecessary Sphinx warnings during builds,
made navigation more difficult for new users.
Updating these links ensures users are directed to the correct installation guide and maintains the integrity of the documentation.
Validation
All affected files were updated manually and verified through a filesystem search. Only actual hyperlinks were modified; non-link references such as CSS files, images, and internal anchors were left unchanged.