[docs] Use images from fuchsia.dev

VS Code does not allow extension README.md files to reference image
resources from within the extension's package. Instead, these images
need to be hosted on HTTPS servers (not even data URL are acceptable).
Unfortunately, gitiles is unable to host images. Instead, we now host
these images on fuchsia.dev and reference them from the README.md.

Change-Id: I00a0082205fecfc8e83262af54adadf22849bf0c
Reviewed-on: https://fuchsia-review.googlesource.com/c/vscode-plugins/+/1043315
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: Jacob Rutherford <jruthe@google.com>
diff --git a/README.md b/README.md
index 9009233..0f79383 100644
--- a/README.md
+++ b/README.md
@@ -14,23 +14,23 @@
 
  1. Select a Fuchsia device using the Device Selector in the bottom toolbar:
 
-    ![Device Selector](resources/device-selector.png)
+    ![Device Selector](https://fuchsia.dev/static/fuchsia-src/images/vscode-plugin/device-selector.png)
 
  2. Select "Show log for _device name_" from quick picker:
 
-    ![Show log](resources/show-logs.png)
+    ![Show log](https://fuchsia.dev/static/fuchsia-src/images/vscode-plugin/show-logs.png)
 
 
  3. View the logs:
 
-    ![Log viewer](resources/log-viewer.png)
+    ![Log viewer](https://fuchsia.dev/static/fuchsia-src/images/vscode-plugin/log-viewer.png)
 
 ### Run and debug tests
 
  1. Select the "Testing" tab from the left navigation bar and view the list of
     tests in your current build configuration:
 
-    ![Test explorer](resources/debug-test.png)
+    ![Test explorer](https://fuchsia.dev/static/fuchsia-src/images/vscode-plugin/debug-test.png)
 
  2. Click the "Run Test" or "Debug Test" button to run or debug the test.
     Double-click the test to jump to the `BUILD.gn` that defines the test.
@@ -40,7 +40,7 @@
  1. Select the "Run and Debug" tab from the left navigtaion bar and expand the
     "Fuchsia Components" panel to view the components running on the device:
 
-    ![Component explorer](resources/debug-component.png)
+    ![Component explorer](https://fuchsia.dev/static/fuchsia-src/images/vscode-plugin/debug-component.png)
 
  2. Click the "Attach Debugger" button to attach the debugger to the component.
     Set a breakpoint by clicking to the left of a line of source code to stop
diff --git a/resources/debug-component.png b/resources/debug-component.png
deleted file mode 100644
index 49baa26..0000000
--- a/resources/debug-component.png
+++ /dev/null
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diff --git a/resources/debug-test.png b/resources/debug-test.png
deleted file mode 100644
index d94cd53..0000000
--- a/resources/debug-test.png
+++ /dev/null
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diff --git a/resources/device-selector.png b/resources/device-selector.png
deleted file mode 100644
index c10d769..0000000
--- a/resources/device-selector.png
+++ /dev/null
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diff --git a/resources/fuchsia-explorer.png b/resources/fuchsia-explorer.png
deleted file mode 100644
index a771ef4..0000000
--- a/resources/fuchsia-explorer.png
+++ /dev/null
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diff --git a/resources/log-viewer.png b/resources/log-viewer.png
deleted file mode 100644
index d09111e..0000000
--- a/resources/log-viewer.png
+++ /dev/null
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diff --git a/resources/show-logs.png b/resources/show-logs.png
deleted file mode 100644
index d52ee1e..0000000
--- a/resources/show-logs.png
+++ /dev/null
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