Add st7701s and rpi_dpi_rgb docs

[clydebarrow]

Description:

Related issue (if applicable): fixes

Pull request in esphome with YAML changes (if applicable): esphome/esphome#5872

Checklist:

• [x] I am merging into next because this is new documentation that has a matching pull-request in esphome as linked above.
  or

• [ ] I am merging into current because this is a fix, change and/or adjustment in the current documentation and is not for a new component or feature.

• [x] Link added in /index.rst when creating new documents for new components or cookbook.

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[DannyN2222]

I dont think i can raise a PR to a PR so ill just add it as a comment this display (https://www.elecrow.com/esp32-display-7-inch-hmi-display-rgb-tft-lcd-touch-screen-support-lvgl.html) works with this example config:

esphome:
  name: 7.0_inch_800x480_rgb_tft_lcd_example_config
  platformio_options:
    board_build.flash_mode: dio
esp32:
  board: esp32-s3-devkitc-1
  flash_size: 4MB
  framework:
    type: esp-idf
# Required to achieve sufficient PSRAM bandwidth
    sdkconfig_options:
      CONFIG_ESP32S3_DEFAULT_CPU_FREQ_240: y
      CONFIG_ESP32S3_DATA_CACHE_64KB: y
      CONFIG_SPIRAM_FETCH_INSTRUCTIONS: y
      CONFIG_SPIRAM_RODATA: y
display:
  - platform: rpi_dpi_rgb
    id: main_display
    color_order: RGB
    auto_clear_enabled: false
    dimensions:
      width: 800
      height: 480
    de_pin: 41
    hsync_pin: 39
    vsync_pin: 40
    pclk_pin:
      number: 0
      ignore_strapping_warning: true
    pclk_frequency: 25MHz
    update_interval: 3s
    hsync_pulse_width: 48
    hsync_front_porch: 40
    hsync_back_porch: 40
    vsync_pulse_width: 31
    vsync_front_porch: 1
    vsync_back_porch: 40
    # Replace XX with the correct pin number
    # Order is for big_endian (typically required.)
    data_pins:
      - 8        #g3
      - 16        #g4
      - 1        #g5
      - 14        #r1
      - 21        #r2
      - 47        #r3
      - 48        #r4
      - number: 45        #r5
        ignore_strapping_warning: true
      - 15        #b1
      - 7        #b2
      - 6        #b3
      - 5        #b4
      - 4        #b5
      - 9        #g0
      - number: 46        #g1
        ignore_strapping_warning: true
      - number: 3        #g2
        ignore_strapping_warning: true

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