You can now edit the image links for the discord webhooks in the webhooks.yml file.
Code (YAML):
# URLs to load images for the message avatar and embed image
# {uuid} is replaced with the player's uuid
# {name} is replaced with the player's name
# {texture} is replaced with the player's skin texture id
# {any} will use the first available in the order: texture->uuid->name
avatar-url
: 'https://mc-heads.net/head/
{
any
}.png'
image-url
: 'https://mc-heads.net/avatar/
{
any
}/128.png'