docs(console): revert "update screenshots in README (#419)"

This reverts commit 4f71484. This
commit breaks the existing docs, because it deletes images that are
linked in the current `docs.rs` documentation for `tokio-console`. Also,
we probably ought to resize the images so the text doesn't get scaled.

In the future, when adding new screenshots, let's make sure not to
delete the existing ones, because their GitHub URLs are referenced by
prior versions of the docs (cc @hds).

We should probably figure out a nicer image hosting solution
eventually...

tokio-console/README.md

@@ -106,14 +106,14 @@ Using the <kbd>&#8593;</kbd> and <kbd>&#8595;</kbd> arrow keys, an individual ta
 Pressing<kbd>enter</kbd> while a task is highlighted displays details about that
 task:
 
-![task details](https://raw.githubusercontent.com/tokio-rs/console/main/assets/task_details.png)
+![task details](https://raw.githubusercontent.com/tokio-rs/console/main/assets/details2.png)
 
 Pressing the <kbd>escape</kbd> key returns to the task list.
 
 The <kbd>r</kbd> key switches from the list of tasks to a list of [resources],
 such as synchronization primitives, I/O resources, et cetera:
 
-![resource list](https://raw.githubusercontent.com/tokio-rs/console/main/assets/resources_list.png)
+![resource list](https://raw.githubusercontent.com/tokio-rs/console/main/assets/resources.png)
 
 
 Pressing the <kbd>t</kbd> key switches the view back to the task list.
@@ -122,13 +122,13 @@ Like the task list view, the resource list view can be navigated using the
 <kbd>&#8593;</kbd> and <kbd>&#8595;</kbd> arrow keys. Pressing <kbd>enter</kbd>
 while a resource is highlighted displays details about that resource:
 
-![resource details --- sleep](https://raw.githubusercontent.com/tokio-rs/console/main/assets/resource_details_sleep.png)
+![resource details --- oneshot](https://raw.githubusercontent.com/tokio-rs/console/main/assets/resource_details1.png)
 
 The resource details view lists the tasks currently waiting on that resource.
-This may be a single task, as in the [`tokio::time::Sleep`] above, or
-a large number of tasks, such as this private `tokio::sync::batch_semaphore::Semaphore`:
+This may be a single task, as in the [`tokio::sync::oneshot`] channel above, or
+a large number of tasks, such as this [`tokio::sync::Semaphore`]:
 
-![resource details --- semaphore](https://raw.githubusercontent.com/tokio-rs/console/main/assets/resource_details_semaphore.png)
+![resource details --- semaphore](https://raw.githubusercontent.com/tokio-rs/console/main/assets/resource_details2.png)
 
 Like the task details view, pressing the <kbd>escape</kbd> key while viewing a resource's details
 returns to the resource list.