[Feature Request]Edit article

[askender]

It is a basic feature.
Because we use IPFS cid, and no private id is used, we should design it for better web3 experience.

If people update a atricle,

• we need a table to record the cid relation between different versions
• we need update the record of article for a new cid
• we need frontend page can detact new versions and remind users redirect to new versions
• we need sign a msg to make only authors can update the info.

[askender]

finished 1 and 2 sub-feature of the issue:

• we need a table to record the cid relation between different versions
• we need update the record of article for a new cid
• we need frontend page can detact new versions and remind users redirect to new versions
• we need sign a msg to make only authors can update the info.

For sub-feature 3, we will finish it later.
For sub-feature 4, we will use sig of login to check if people can update the article.

[askender]

【we need sign a msg to make only authors can update the info.】 This is finished.