GitHub Pages doesn't support including content from a separate repository within your .github.io repository directly however you can use:
Submodules: linking a specific repository in your .github.io repository to another Git repository (the "submodule"). It allows you to manage the submodule's content independently.
Build tools: Some build tools and frameworks like Jekyll or Hugo can integrate external content sources. These tools can potentially fetch content from another repository during the build process and incorporate it into your final website.
Instead of having a copy of profile's about me in this repo's about me, try to use directly the first one.