consequences of the vim deprecation

### Description I guess https://github.com/catppuccin/nvim/pull/949 also means integrations for plugins like `lightline` also stop working. (of course people can probably migrate from `lightline` to `lualine`, but they have to know) If this is intended (and I guess it is), we should also update the [*integrations* section of the `README.md`](https://github.com/catppuccin/nvim?tab=readme-ov-file#integrations) ### Neovim version ```markdown NVIM v0.12.1 Build type: RelWithDebInfo LuaJIT 2.1.1774896198 Run "nvim -V1 -v" for more info ``` ### Terminal and multiplexer st with tmux (but not really relevant here) ### Catppuccin version / branch / rev 426dbeb ### Steps to reproduce none, it's about the docs ### Expected behavior none, it's about the docs ### Actual behavior none, it's about the docs ### Repro ```Lua not relevant here ```