Found 4 link issues

[github-actions[bot]]

Link issues by awesome_bot

Line	Status	Link
84	301	https://swiftotter.com/training-home redirects to https://swiftotter.com/training
90	301	https://www.packtpub.com/product/magento-2-beginners-guide/9781785880766 redirects to https://www.packtpub.com/product/not-set/9781785880766
99	301	https://www.packtpub.com/product/magento-2-theme-design-second-edition/9781785888229 redirects to https://www.packtpub.com/product/not-set/9781785888229
440	307	https://www.magentoassociation.org/ redirects to https://www.magentoassociation.org/home

[aleron75]

fixed in 6cb3796