Add Instructions for Running Slasher + Motivations about documentation HOT 7 CLOSED

I take it this is something that should go under 'how Prysm works'?

from documentation.

from documentation.

Exact syntax to run slasher will vary by OS & again by prysm.sh/prysm.bat/docker/bazel. Might make more sense having a "Run Slasher" page per OS?

from documentation.

Imho it doesn't warrant it's own page with 1 command, better to just bundle it with existing pages and link back to a slasher specific section in how prysm works to explain motive.

from documentation.

Also need an update to list available flags: https://docs.prylabs.network/docs/prysm-usage/parameters/

from documentation.

Flags for Slasher:

cmd OPTIONS:
--clear-db Prompt for clearing any previously stored data at the data directory (default: false)
--config-file value The filepath to a yaml file with flag values
--datadir value Data directory for the databases and keystore (default: "/Users//Library/Eth2")
--enable-tracing Enable request tracing. (default: false)
--force-clear-db Clear any previously stored data at the data directory (default: false)
--log-file value Specify log file name, relative or absolute
--log-format value Specify log formatting. Supports: text, json, fluentd. (default: "text")
--monitoring-port value Port used to listening and respond metrics for prometheus. (default: 8082)
--trace-sample-fraction value Indicate what fraction of p2p messages are sampled for tracing. (default: 0.2)
--tracing-endpoint value Tracing endpoint defines where beacon chain traces are exposed to Jaeger. (default: "http://127.0.0.1:14268/api/traces")
--tracing-process-name value The name to apply to tracing tag "process_name"
--verbosity value Logging verbosity (trace, debug, info=default, warn, error, fatal, panic) (default: "info")

debug OPTIONS:
--cpuprofile value Write CPU profile to the given file
--memprofilerate value Turn on memory profiling with the given rate (default: 524288)
--pprof Enable the pprof HTTP server (default: false)
--pprofaddr value pprof HTTP server listening interface (default: "127.0.0.1")
--pprofport value pprof HTTP server listening port (default: 6060)
--trace value Write execution trace to the given file

slasher OPTIONS:
--beacon-rpc-provider value Beacon node RPC provider endpoint (default: "localhost:4000")
--beacon-tls-cert value Certificate for secure beacon gRPC connection. Pass this in order to use beacon gRPC securely.
--rebuild-span-maps Rebuild span maps from indexed attestations in db (default: false)
--rpc-port value RPC port exposed by the slasher (default: 5000)
--tls-key value Key for secure gRPC. Pass this and the tls-cert flag in order to use gRPC securely.

from documentation.

Seems that --tls-cert may be missing?

from documentation.