As Miraheze does not allow external advertisement on custom skins(by its content policy), it is not possible to use the original Liberty skin(https://github.com/librewiki/liberty-skin). In order to avoid the issue, I modified the skin to remove google ads and sharing buttons to SNS accounts in the skin. However, there may be some problems which cause damage to server, so I request a review. If it is acceptable to use, I will soon request to install the skin in Bigforest Wiki (https://bigforest.miraheze.org/)
Here is the URL of the repository that stores my variant of Liberty Skin.
https://github.com/utolee90/Liberty-Skin-for-BigforestPedia1