More restaking/LST docs, organizing developer/network pages better

[drewstone]

Summary of changes

Provide a detailed description of proposed changes.

• Include restaking and liquid staking documentation
• Include Tangle parachain docs in liquid staking section
• Refactor developers and network page

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
• [x] I have added necessary documentation (if appropriate)

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