Prevent clickjacking client side

[puria]

• [ ] Double check that there is no way to set CSP directives and/or x-frame-options settings via github pages settings
• [ ] Not very secure thing, but can implement frame-busting, client side

thanks Kunal ;p

[puria]

Some random references:

• https://cheatsheetseries.owasp.org/cheatsheets/Clickjacking_Defense_Cheat_Sheet.html
• https://stackoverflow.com/questions/958997/frame-buster-buster-buster-code-needed
• https://auth0.com/blog/preventing-clickjacking-attacks/