* Update leak-detector-m5stickC.rst
1) The ST7735 display is now natively supported in ESPHome >1.16.0. Therefore the custom component is no longer needed. Also, ESPHome color handling seems to have changed, so that has been accounted for. Updated the instructions and code to reflect these.
2) Updated URL of esp32 bootloader
3) Added st7735 display docs link to footer
* Update cookbook/leak-detector-m5stickC.rst
Co-authored-by: Oxan van Leeuwen <oxan@oxanvanleeuwen.nl>