[docs] update tangle and dkg documentation

[1xstj]

Summary of changes

• Updates all tangle and dkg related pages

Proposed area of change

Put an x in the boxes that apply.

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

Reference issue to close (if applicable)

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

• Closes #72 #73 #74 #75

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Code Checklist

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

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