* Validate pubkey, relay URL and secret of NWC URL
* Fix NWC secret regexp
* Use sequential validation in Yup schema
* Add note about possible mismatch between hostnames and pubkeys
* Remove unused param
* Parse image links during markdown rendering
* Use imgproxy to replace links
* Add healthcheck
See https://docs.imgproxy.net/healthcheck
* Enable WebP and animation support
* Only replace image URLs
* Replace all occurrences
* Fix creating posts with no text
* Embed image on link posts where link is image
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Co-authored-by: ekzyis <ek@stacker.news>