Fix TS SDK Instance docs; Add SSH key and streaming payments examples

[MHHukiewitz]

The previous version of the docs had wrong parameters in the use of client.create_instance(). This has been fixed with a minimal example and expanded to contain explanations on SSH keys and how to create streaming payments instances.

Based on #75

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• https://ipfs-2.aleph.im/ipfs/QmcSWPQS6Ap5CkF7saVAAazzMa4n2cZcAPTxtBgUt3PUxM
• https://beta.docs.aleph.im/ (may be overriden anytime by another PR)

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Deployed (not pinned) on:

• https://ipfs-2.aleph.im/ipfs/QmVFgDykiFuWYZKj67GTxYzFXVDVX3hnRB51CRvLYR8Qv4
• https://beta.docs.aleph.im/ (may be overriden anytime by another PR)

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Deployed (not pinned) on:

• https://ipfs-2.aleph.im/ipfs/QmcjBxz28zNtTRVB8jfGAeby8nzsxp36cdWUo9znFfW1Na
• https://beta.docs.aleph.im/ (may be overriden anytime by another PR)