Update supported TSS list and add github repo link

[salman01zp]

Summary of changes

• Added SilentShardDKLS23Secp256k1 to TSS list
• Added github link to services provided by tangle
• Reference session keys guide from polkadot docs
• Update doc link to supported Ethereum methods

Provide a detailed description of proposed changes.

-

Proposed area of change

Put an x in the boxes that apply.

• [ ] Overview
• [ ] Anchor System
• [ ] dApps
• [ ] Tangle
• [ ] Protocols
• [ ] Relayers

Reference issue to close (if applicable)

Specify any issues that can be closed from these changes (e.g. Closes #233).

• Closes

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Code Checklist

• [ ] I have tested that prove my changes are working as intended
• [ ] I have added necessary documentation (if appropriate)

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