docs: reformat sponsor card docs

Move sponsor card documentation into home page configuration page, and
reformat as a table of property values and an example configuration.

Author: ethanwu10

docs/content/management/home.md

@@ -5,7 +5,7 @@ The home page of your CTF can be configured with various content in markdown and
 In addition to normal HTML, you can use some custom elements.
 
 * `<timer></timer>`: a countdown timer until the beginning or end of the CTF
-* `<sponsors></sponsors>`: a list of sponsor cards [to configure the sponsors card look here](sponsors.md)
+* `<sponsors></sponsors>`: a list of sponsor cards ([see configuration](#sponsor-cards))
 * `<action-button></action-button>`: a button with hover effects, generally used as a link to `/register`
 
 ```yaml
@@ -27,3 +27,35 @@ homeContent: |
 
   <sponsors></sponsors>
 ```
+
+## Sponsor Cards
+
+The `<sponsors>` element can be used to display cards for the sponsors listed in
+the config under `sponsors`.
+
+### Configuration
+
+The `sponsors` key takes an array of sponsor elements, which are each an object
+with the following properties:
+
+| Key           | Default  | Description                       |
+| ------------- | -------- | --------------------------------- |
+| `name`        | _(none)_ | sponsor name                      |
+| `icon`        | _(none)_ | sponsor icon URL                  |
+| `description` | _(none)_ | sponsor description               |
+| `small`       | `false`  | whether to show as a compact card |
+
+### Example
+
+```yaml
+sponsors:
+  - name: Foo
+    icon: https://example.com/foo.png
+    description: |
+      An excellent sponsor
+  - name: Bar
+    icon: https://example.com/bar.png
+    description: |
+      An excellent sponsor
+    small: true
+```