feat(rust): add syntax highlighting for command's fenced code blocks

implementations/rust/ockam/ockam_command/Cargo.toml

@@ -40,7 +40,7 @@ dockerfile = "../../../../tools/cross/Cross.Dockerfile.armv7"
 # `../ockam`) and the `ockam` binary (in `./src/bin/ockam.rs`). I won't
 # enumerate them here, but an example: `rustdoc` will try to place the docs for
 # both of these in the same path, without realizing it, which may result in one
-# overwriting the other)
+# overwriting the other
 #
 # Anyway a result, we disable them for the binary crate, which is just a single
 # file (`src/bin/ockam.rs`) which contains a single function call into
@@ -86,6 +86,7 @@ open = "5.1.0"
 opentelemetry = { version = "0.21.0", features = ["metrics", "trace"] }
 opentelemetry-otlp = { version = "0.14.0", features = ["metrics", "tls", "logs", "trace"], default-features = false }
 pem-rfc7468 = { version = "0.7.0", features = ["std"] }
+r3bl_ansi_color = "0.6.9"
 r3bl_rs_utils_core = "0.9.12"
 r3bl_tui = "0.5.2"
 r3bl_tuify = "0.1.25"
@@ -103,6 +104,7 @@ serde_yaml = "0.9"
 shellexpand = { version = "3.1.0", default-features = false, features = ["base-0"] }
 strip-ansi-escapes = "0.2.0"
 syntect = { version = "5.2.0", default-features = false, features = ["default-syntaxes", "regex-onig"] }
+termbg = "0"
 thiserror = "1"
 time = { version = "0.3", default-features = false, features = ["std", "local-offset"] }
 tiny_http = "0.12.0"