Add a Frequently Asked Questions section

[heeckhau]

here have been a few common questions that we could address on the website:

• why is a Notary necessary. why can't plain TLS authenticate data without a Notary(done)
• does the Notary MITM the User's connection
• what is the approx. cost/ how long it takes to notarize (done)

[themighty1]

Also:

• reiterate the trust assumptions(done)
• how is our approach different from using a TEE
• why is websocket proxy hosted by the Verifier needed and whether it introduces any new trust assumptions

[themighty1]

Some more items to address:

• payload size limitation in the tlsn crate
• the presence of a TLS timeout which may cause the proving to fail
• the reason why http compression must be disabled