[hub75] Add component to indexes (#5760)

Author: stuartparmenter

content/components/_index.md

@@ -745,6 +745,7 @@ Often known as "tag" or "card" readers within the community.
 "ILI9486","components/display/ili9xxx","ili9341.jpg"
 "ILI9488","components/display/ili9xxx","ili9488.svg"
 "WSPICOLCD","components/display/ili9xxx","ili9488.svg"
+"HUB75 LED Matrix","components/display/hub75","hub75.svg"
 "Inkplate","components/display/inkplate","inkplate6.jpg"
 "LCD Display","components/display/lcd_display","lcd.jpg"
 "MAX7219 Dot Matrix","components/display/max7219digit","max7219digit.jpg"

content/components/display/_index.md

@@ -18,6 +18,7 @@ graphical displays with fully addressable pixels.
 - Graphical displays with fully addressable pixels, such as
   {{< docref "mipi_spi" "SPI interfaced LCDs" >}},
   {{< docref "waveshare_epaper" "E-Paper" >}},
+  {{< docref "hub75" "HUB75 LED matrices" >}},
   and {{< docref "ssd1306" "OLED" >}}.
 
 For graphical displays, which offer the greatest flexibility, there are two options for displaying content: