test add all highlight functionality

[erauner12]

go easy on me 🙂 first PR in javascript. No need to merge this, just trying to get the idea out there

[erauner12]

@mtopping let me know what changes you think should be made. The reason I attempted this is because I noticed that the original url only provided the first 3 highlights of every bookmark.

• there still needs to be some changes to src/components/BookmarkBlock.svelte. I've only tested with the following code block

```raindrop
collection: 0
format: list
search: highlights:true
sort: -created
showTags: true