[st7701s] [mipi_rgb] Document deprecation of st7701s in favor of mipi_rgb (#5597)

Author: jspiros

content/components/display/st7701s.md

@@ -14,6 +14,10 @@ params:
 This display driver supports displays with 16 bit parallel interfaces, often referred to as "RGB". It currently
 supports the ST7701S chip.
 
+> [!WARNING]
+> This component has been made redundant since the ST7701S is now supported by the {{< docref "mipi_rgb" >}}.
+> This component will be removed in a future release.
+
 This driver has been tested with the following displays:
 
 - Seeed Sensecap Indicator