docs: add tokio-console installation section (#313)

## Description

This PR adds a section for installing the tokio-console crate as well as
fixes some broken console links. All changes were made to the README.
Even though the tokio-console crate has its own README that includes
installation, users will likely stumble upon the root README first.
Thus, the purpose of this PR is to aid folks who may not wish to clone
the repository when trying out the project.

## Commit Notes

- Add tokio-console installation section in the README as the primary
  method of using tokio-console
- Move the local cargo run option to its own alternative method section
- Update broken console links to use tokio-console in the README
- Add ".idea" to gitignore
- Update cargo install to use "--locked" flag in the nested README

## Additional Notes

Excellent project! Thank you for this.

Signed-off-by: Nick Gerace <nickagerace@gmail.com>
Co-authored-by: Eliza Weisman <eliza@buoyant.io>

.gitignore

@@ -2,3 +2,4 @@
 **/target
 **/result
 **/*.swp
+**/.idea

README.md

@@ -38,7 +38,7 @@ toolkit consists of multiple components:
   [`tracing`].
 
 * tools for **displaying and exploring diagnostic data**, implemented as gRPC
-  clients using the console wire protocol. the [`console`] crate implements an
+  clients using the console wire protocol. the [`tokio-console`] crate implements an
   **an interactive command-line tool** that consumes this data, but **other
   implementations**, such as graphical or web-based tools, are also possible.
 
@@ -129,11 +129,23 @@ notes:
 
 ### running the console
 
-to **run the console command-line tool**, simply
+to **run the console command-line tool**, install `tokio-console` from [crates.io](https://crates.io/crates/tokio-console)
+
+```shell
+$ cargo install --locked tokio-console
+```
+
+and run locally
+
 ```shell
-$ cargo run
+$ tokio-console
 ```
-in this repository.
+
+> **alternative method:** run the tool from a local checkout of this repository
+>
+> ```shell
+> $ cargo run
+> ```
 
 by default, this will attempt to connect to an instrumented application running
 on localhost on port 6669. if the application is running somewhere else, or is
@@ -248,7 +260,7 @@ cargo run --example $name
 [`tracing-subscriber`]: https://lib.rs/crates/tracing-subscriber
 [`console-api`]: ./console-api
 [`console-subscriber`]: ./console-subscriber
-[`console`]: ./console
+[`tokio-console`]: ./tokio-console
 [`Layer`]: https://docs.rs/tracing-subscriber/latest/tracing_subscriber/layer/trait.Layer.html
 [`tracing` targets]: https://docs.rs/tracing/latest/tracing/struct.Metadata.html
 [`TRACE` level]: https://docs.rs/tracing/latest/tracing/struct.Level.html#associatedconstant.TRACE

tokio-console/README.md

@@ -72,7 +72,7 @@ use the [Tokio] runtime, this means that:
 Once the application is instrumented, install the console CLI using
 
 ```shell
-cargo install tokio-console
+cargo install --locked tokio-console
 ```
 
 Running `tokio-console` without any arguments will connect to an application on