Add Warning Section

[micchickenburger]

Add a warning element that informs the user if they:

• Do not have Javascript enabled
• Do not support necessary features like WebCrypto Subtle Crypto interface, BigInt primitives, IndexedDB, and other modern ECMAScript features employed by the tool
• Use a weak cipher for encryption
• Use an encryption cipher that does not support integrity protection
• Exhaust their PRNG pool
• Choose a weak or broken digest or password hashing algorithm
• Choose weak parameters during key generation or password hashing