updated the astro-compress dependency (fixes #5)

[diraneyya]

Previously, the code relied on a deprecated version of the astro-compress package which was not served by the npm registry anymore, causing pnpm i to fail.

As I upgraded the template to using the oldest non-deprecated version of the dependency, it worked like a charm (despite the major version of the dependency changing), hence I am pushing the change for anyone else who wants to try this beautiful theme.