Synthesize builder legal agreements

All legal agreements that member's agree to upon joining should be updated, simplified and synthesized into one master "Builder Terms & Conditions".

Currently this includes

- Operating Agreement
- Contractor Term Sheet
- Participation Terms & Conditions
- Privacy Policy (drafted, never ratified)

The Member T&Cs will be hosted on IPFS and agreed to in the Activation Proposal.

There will also be a title page which summarizes the key points, as was done in the Dxdao Participation Agreement.

首先收集 Operating Agreement、Contractor Term Sheet、Participation Terms & Conditions 以及 Privacy Policy 草案，然后查看 Dxdao Participation Agreement，了解提议的标题页格式。完成标准是将这些协议简化为一份 Builder Terms & Conditions 文档，其中包含重点内容标题页，以及所述的 IPFS 和 Activation Proposal 引用。

由索引模型根据 Issue 内容生成。