Version anchors in changelog aren't stable

[jedcunningham]

Describe the bug The latest release is always #id1, which means there is no way to deep link to a specific version across time.

e.g. today id1 is 1.7.0, but at one point it pointed at 1.6.2.

https://astro-sdk-python.readthedocs.io/en/stable/CHANGELOG.html#id1