Replace many dead links with web.archive.org equivalants.

[IoIxD]

There was quite a few dead links, especially at the beginning. This PR replaces them with the most recent web.archive.org snapshot

[catwell]

It would probably be better to replace them with the new links for those projects when they exist, especially when they are lunarmodules projects!

I.e.:

• https://keplerproject.github.io/luadoc/
• https://lunarmodules.github.io/luafilesystem/

The textui docs link (https://nilnor.github.io/textui/docs/) appears to work for me.

Using archive.org for z/OS might make sense, or we may just remove the reference.

[alerque]

Much like @catwell suggested it would be much better to link to the new homes of these projects rather than to archived versions of their old homes. Even if the exact same page is not available we should adjust the references so that we link to current resources. If anything is really no longer available we should probably just rewrite the docs to avoid the reference and substitute something current or at least make sure it is a minor point.

Thanks for taking the time to contribute. Are you able to update this PR with current links?

[IoIxD]

Swear it didn't work for me, but yeah I guess it does. Fixed.

[IoIxD]

Done.

[alerque]

Thanks for the contribution.