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
ndarray/dtype-ctor	$\color{red}419/420$ $\color{green}+99.76\%$	$\color{red}41/46$ $\color{green}+89.13\%$	$\color{green}12/12$ $\color{green}+100.00\%$	$\color{red}419/420$ $\color{green}+99.76\%$
stats/incr/nangmean	$\color{green}128/128$ $\color{green}+100.00\%$	$\color{green}7/7$ $\color{green}+100.00\%$	$\color{green}2/2$ $\color{green}+100.00\%$	$\color{green}128/128$ $\color{green}+100.00\%$

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

[stdlib-bot]

PR Commit Message

docs: update related packages sections

PR-URL: https://github.com/stdlib-js/stdlib/pull/8203

Reviewed-by: Philipp Burckhardt <pburckhardt@outlook.com>

Please review the above commit message and make any necessary adjustments.