fix: Add homepage url to aztec.js package.json (#2196)

Add
https://github.com/AztecProtocol/aztec-packages/tree/master/yarn-project/aztec.js
as the homepage url for aztec.js.

# Checklist:
Remove the checklist to signal you've completed it. Enable auto-merge if
the PR is ready to merge.
- [ ] If the pull request requires a cryptography review (e.g.
cryptographic algorithm implementations) I have added the 'crypto' tag.
- [x] I have reviewed my diff in github, line by line and removed
unexpected formatting changes, testing logs, or commented-out code.
- [x] Every change is related to the PR description.
- [ ] I have
[linked](https://docs.github.com/en/issues/tracking-your-work-with-issues/linking-a-pull-request-to-an-issue)
this pull request to relevant issues (if any exist).

yarn-project/aztec.js/package.json

@@ -1,5 +1,6 @@
 {
   "name": "@aztec/aztec.js",
+  "homepage": "https://github.com/AztecProtocol/aztec-packages/tree/master/yarn-project/aztec.js",
   "version": "0.1.0",
   "type": "module",
   "exports": {