v0.6 doc updates

_docs/connectors.md

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+# connectors
+
+`ctop` comes with the below native connectors, enabled via the `--connector` option.
+
+Default connector behavior can be changed by setting the relevant environment variables.
+
+## Docker
+
+Default connector, configurable via standard [Docker commandline varaibles](https://docs.docker.com/engine/reference/commandline/cli/#environment-variables)
+
+### Options
+
+Var | Description
+--- | ---
+DOCKER_HOST | Daemon socket to connect to (default: `unix://var/run/docker.sock`)
+
+## RunC
+
+Using this connector requires full privileges to the local runC root dir (default: `/run/runc`)
+
+### Options
+
+Default connector behavior can be changed by setting the below environment variables:
+
+Var | Description
+--- | ---
+RUNC_ROOT | path to runc root (default: `/run/runc`)
+RUNC_SYSTEMD_CGROUP | if set, enable systemd cgroups