Add support for Hashnode

[yonatankarp]

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Description

Add support for publication using the hashnode API

Describe the solution you'd like

Allow this action to publish posts to hashnode as well as medium and dev.io

Describe alternatives you've considered

Using another action that will handle the publication for hashnode and pass the canonical URL to this action once #23 is implemented

[protiumx]

Hi! I'm not really familiar with Hashnode but as far as I can tell it wouldn't be difficult to support it. Will take a look next week!

[yonatankarp]

Sounds great! To the best of my understanding, they are using GraphSQL for their API, but TBH I did not look deeply into the topic...