Updated license
Corrected Apache Kafka definition
Updated history
Compression and checkpointing updated
Streams topology
Filled indexes, isolation and other minor topics
Updated storage model
Added RocksDB in the "derived from" section.
Updated logo
Why data model is both key-value and relational
Storage architecture and organization updated.
Updated logging
Storage organization updated.
Fixed markdown issue?
Added about Kafka to description, and completed query interface section.
Description and data model updated
Metadata update