feat: add setBaseUrl and setKey methods to BarkClient class

fix: update version to 3.0.1 in package.json

feat!: update version to 3.0.0

fix: enhance icon validation in BarkPushPayload to check for valid UR…

…L and JPG format

fix!: update version to 2.0.3 in package.json

fix: simplify usage example in README by removing unused BarkOptions …

…type

fix: move Bark types into index file and remove types folder

fix: update import path for Bark types to improve module resolution

fix: update types path in package.json to point to src directory

fix: update package.json to use "types" instead of "typings" for Type…

…Script definitions