docs: update related packages sections

[stdlib-bot]

This PR

• updates the related packages section of READMEs to include links to related packages.

[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
blas/ext/base/ssort2ins	$\color{green}521/521$ $\color{green}+100.00\%$	$\color{green}41/41$ $\color{green}+100.00\%$	$\color{green}4/4$ $\color{green}+100.00\%$	$\color{green}521/521$ $\color{green}+100.00\%$

The above coverage report was generated for the changes in this PR.

[kgryte]

The README in ssort2ins still needs to be fixed.

[Planeshifter]

README sections broken for this package; changes in this PR are undesired.