fix: Add link to example contracts in the monorepo (#2219)

Adds a link in the getting started - CLI page to the source code of the
example contracts.

closes #2178 

# Checklist:
Remove the checklist to signal you've completed it. Enable auto-merge if
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- [ ] 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.
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[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).

docs/docs/dev_docs/getting_started/cli.md

@@ -46,6 +46,8 @@ We have shipped a number of example contracts in the `@aztec/noir-contracts` npm
 
 #include_code example-contracts yarn-project/end-to-end/src/cli_docs_sandbox.test.ts bash
 
+You can see all of our example contracts in the monorepo [here](https://github.com/AztecProtocol/aztec-packages/tree/master/yarn-project/noir-contracts/src/contracts).
+
 In the following sections there will be commands that require contracts as options. You can either specify the full directory path to the contract abi, or you can use the name of one of these examples as the option value. This will become clearer later on.
 
 ## Creating Accounts