Replaced custom Nerd Fonts overrides with predefined ones. Removed unused Neovim settings and plugins, and disabled Neovim for a specific user. Updated various flake dependencies to their latest versions.
This commit introduces a new substituter 'https://attic.teepot.org/tee-pot' and its associated trusted key 'tee-pot:SS6HcrpG87S1M6HZGPsfo7d1xJccCGev7/tXc5+I4jg='. The changes affect the Nix, aesmd_dcap, home settings, and pccs modules. This update provides additional package sources for these modules.
