Add Docker dumping docs

[FabijanC]

Usage related changes

• Updated documentation section with dumping/loading info for dockerized Devnet
• Fixed language/typographical errors in latest and 0.0.6 docs.

[FabijanC]

shouldn't this be website/versioned_docs/version-0.0.7/blocks.md instead of website/versioned_docs/version-0.0.6/blocks.md?

0.0.7 documentation directory is created only when v0.0.7 is released