Fix broken peerdavid GitHub links

[synthead]

Fixes https://github.com/sqfmi/watchy-docs/issues/36.

Updates peerdavid's GitHub links to https://github.com/peerdavid/wos.

cc @peerdavid

Background

The last good commit from the peerdavid/Watchy repo is https://github.com/peerdavid/Watchy/commit/3a32880b93c926f6ac5d996ee8d7ebffbdfe0136. Here's a link to the currently-shipped repo with this path, pinned to this commit:

https://github.com/peerdavid/Watchy/tree/3a32880b93c926f6ac5d996ee8d7ebffbdfe0136/examples/WatchFaces/David

However, the README.md from the same repo at the current master reads:

THIS REPO IS NO MORE UPDATED OR MAINTAINED. WE MOVED TO https://github.com/peerdavid/wos

Unfortunately, it looks like this was a refactor that has been abandoned, as README.md from the new repo states:

Watchy OS (WOS)

I'm currently woring on WatchyOS (WOS) - its an alternative to the official Watchy code. Instead on heavly relying on inheritance, this project is structured by different components which are controlled by a kernel. This should provide more flexibility and it should become easier for developers to add new features.

More updates are comming soon.

However, as of this writing, the last update was from 8 months ago. In addition, the nice README.md from the peerdavid/Watchy repo is not present in the new repo.

However, this does reflect the latest work by peerdavid, and I think they would appreciate linking to their latest stuff instead of pinning their old stuff to an old commit.

[synthead]

Are there any changes you'd like me to make to this PR?

[sqfmi]

This looks great, thanks for fixing the links!