DOC-BUG: Broken Link to all_possible_config.toml

https://r2r-docs.sciphi.ai/self-hosting/configuration/overview#server-side-configuration has a broken link in the following text

_"For a complete list of configurable parameters and their defaults, refer to our [all_possible_config.toml](https://github.com/SciPhi-AI/R2R/blob/main/py/core/configs/all_possible_config.toml) file."_