fix blog readme
bump samv3 doc date

Add DivaExchange/i2p-sam to SAM libraries list, tenatively marked 3.1, it may implement some parts of 3.2 as well

Simplify Debian page content per suggestions from @anonymousmaybe

Closes #33

See merge request !15

- Try again to fix sublists markdown
- spell check

- Don't increment packet numbers for retransmitted handshake msgs
- Header is input to MixHash(), not AD, in handshake
- Optional compression for router info block
- Attempt to fix sublists markdown

- Switch from AES to ChaCha20 for header encryption
- Switch from router hash to intro key for header encryption
- Extend the receiver loop section

must be in-session as of API 0.9.52.

Already implemented by i2pd; Java I2P fixes will be in 1.6.0.