Add Security Tools and associated APIs.
Bug fixes and minor UI improvements.
- [Security Tools] Add Certificates tool.
- [Security Tools] Add Certificates and Headers tools.
- Restructure main navigation menus to make Security Tools prominent and Binary Converter less prominent.
- Fix a bug on the homepage, where entering data into a calculator preview had no effect.
- Rearrange calculator previews on homepage.
- Security Tools v1.0
- Add /security API with /certificate resource.
- Add associated documentation.