[Feature] Web preferences: enable/disable DevTools and context menu

[kaydotdev]

• [x] I have performed a self-review of my code
• [x] My code follows the style guidelines of this project
• [x] I have added comments to hard-to-understand areas of my code
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes
• [x] I have made corresponding changes to the comments
• [x] I have made corresponding changes to the README.md

[EastSunWong]

这个禁用功能遗漏了Ctrl + Shift + C的调用devtool功能