Community - Document steemd config.ini configuration options

[TimCliff]

As a node operator, it would be beneficial to know everything that is required to properly configure the config.ini file so that the node operates as desired.

• [ ] Determine an appropriate section on the DP to add information about steemd node configurations.
• [ ] List all of the available configurations that are set in the config.ini file.
• [ ] Provide a description of what each of the configuration options does.
• [ ] Provide information on what the accepted values are for each configuration option, and what the values do.

Related issue: https://github.com/steemit/devportal/issues/269

[aaroncox]

It'd also be nice if it defined the dependencies of each plugin.

Like, account history for example, which of the following combinations are valid to support the legacy account history plugin?

• account_history account_history_api condenser_api
• account_history_rocksdb account_history_api condenser_api
• account_history condenser_api
• account_history_rocksdb condenser_api
• account_history account_history_api
• account_history_rocksdb account_history_api

There are a number of permutations at this point with account history and no indication as to which are required by each other.

[TimCliff]

Example: https://github.com/steemit/steem/issues/2667