[Docs] Building a RustyVault Documentation Website

[sunny0826]

In order to make RustyVault better, we decided to build a separate documentation site for RustyVault alone to display and maintain the documentation. The documentation site will be maintained in a separate /docs directory and can be run independently.

TODO

• build site
• CI pipeline
• Page Preview
• i18n
• logo design

[InfoHunter]

I am going to add some badges in the README.md of RustyVault

[InfoHunter]

A crates.io + version badge is added.