Fix: target correct link when multiple matches are present

[imjohnbo]

👋 Hello, this PR should fix #45 by:

1. (src) Getting all elements from HTML clipboard.
2. (src) Finding the first occurrence of the matching text in the plaintext clipboard after a search index.
3. (src) If this is a link, linkify it as before and increment the search index.
4. (src) If it is not a link, simply increment the search index.

NOTE: I'm capping elements at 100,000, which seems reasonable, performant, and avoids accidental infinite loops.

Let me know what you think! See connected GitHub issue for more 👀.

[keithamus]

Looks pretty good. Just some minor comments.

[jclem]

Nice fix, thanks @imjohnbo!