message: docs(theme): update homepage icon description
diff: @@ -88,7 +88,7 @@ Structure of `Feature`:
  - `title`: `string` title
  - `details` (optional): `string` details
  -- `icon` (optional): `string` icon FontClass
  +- `icon` (optional): `string` support absolute or full image links, or icon FontClass
  - `link` (optional): `string` link address
  Feature description
  