Suggestion: Use adapter-static instead of adapter-auto for serverless deployment
Since the app doesn't use SSR, using adapter-auto is unnecessary and has a cost to it. For example, deploying to Cloudflare pages with adapter-auto will incur worker invocations per request.
I've been going back and forth on this. On the one hand you're right, it does use up worker invocations, but on alexandrite.app I basically never get any more than 5-10% of the daily limit for the free tier for Cloudflare Pages, so I've yet to get anywhere near to the point where I'd have to spend any money on hosting.
Additionally I've been considering adding some SSR (with an option to disable it for self hosters) so links to posts can include social meta tags, that way links sent on chat apps can generate a preview, but I haven't made a final decision about it.