Do not fetch disabled links, but copy over all attributes to new link.

[jgerigmeyer]

Description

This doesn't yet include the full fix for #246 because we don't have a robust solution for running the polyfill multiple times on the same page, but it makes two changes:

1. Links with disabled are now ignored entirely.
2. All attributes are copied over from the original link to the new one.

Related Issue(s)

Fixes #254.

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[jamesnw]

LGTM! I think in addition to the mutation observer, we may still want to separately address things like integrity or referrerpolicy, or event handlers that we don't want to bring over. These were initially raised in #242.

[jgerigmeyer]

LGTM! I think in addition to the mutation observer, we may still want to separately address things like integrity or referrerpolicy, or event handlers that we don't want to bring over. These were initially raised in #242.

Hm, good point. Do you think it would be worth compiling a list of either the attributes we want to explicitly exclude, or explicitly include? It's not perfect, but might be better than either the current implementation or this PR?

[jamesnw]

This looks good!