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
constants/float32/sqrt-half	$\color{green}51/51$ $\color{green}+100.00\%$	$\color{green}1/1$ $\color{green}+100.00\%$	$\color{green}0/0$ $\color{green}+100.00\%$	$\color{green}51/51$ $\color{green}+100.00\%$

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

[Planeshifter]

Section tags must be messed up in lib/node_modules/@stdlib/blas/ext/base/ssort2ins/README.md. Blocking this PR.

[kgryte]

@Planeshifter They are messed up in ssortins, for the same reasons as elsewhere. Namely, someone inserted into a "references" section. I simply discarded the changes to that file.