fix(routing): fix Link routing when using custom basepath

[aptmac]

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This is a follow-up to: #1534

Description of the change:

The PR listed above made changes to allow setting a base path for routes, but missed instances of <Link>, so this PR adds the toPath() to those elements.

Motivation for the change:

Fixes routing using <Link> elements when using a custom base path.

[andrewazores]

This looks like it might be nice to refactor out something like a <CryostatLink> component, which is just a wrapper around <Link> with the toPath call internalized.

[aptmac]

Had forgotten to sign my commits, that should be better.