Add docs for wasp 1.4.0

[Dr-Electron]

Description of change

Added the 1.4.0 docs

Type of change

• Documentation Enhancement

Change checklist

• [x] I have followed the contribution guidelines for this project
• [x] I have performed a self-review of my own changes
• [x] I have made sure that added/changed links still work
• [x] I have commented my code, particularly in hard-to-understand areas

[github-actions[bot]]

This pull request has been deployed to Vercel.

Latest commit: f57600463f02abf0e390dd811ba36193b9767d9e

:white_check_mark: Preview: https://iota-wiki-pswus6vhk-iota1.vercel.app

[github-actions[bot]]

This pull request has been deployed to Vercel.

Latest commit: 72d8fb69a2adf6e936da91d70faf6b1395adc47d

:white_check_mark: Preview: https://iota-wiki-8d36y18od-iota1.vercel.app