feat: generate dynamic og image for blog posts (#15)

* feat: add dynamic og image using satori
* feat: add og card styling
* feat: add dynamic paths for ogTitle
* feat: add default og url
* ci: change config site url for testing purpose
* fix: update original auto-generate og image style
* refactor: move ogImage jsx inside generateOgImage
* fix: add conditions for filtering draft posts & ogImages
* build: update minor and major dependency updates
* build: update site option in config file