Remove the WIP status

Besides my [merge-me](https://github.com/auipga/kickstart.nixvim/tree/merge-me) branch (#17), I spotted another 'missing' part: - [ ] Diagnostic Config - [kickstart.nvim/init.lua#L620-L647](https://github.com/nvim-lua/kickstart.nvim/blob/38f4744e254af1b2ce5384d66d7c7da3b5f67106/init.lua#L620-L647) or - [kickstart-modular.nvim/lspconfig.lua#L166-L193](https://github.com/dam9000/kickstart-modular.nvim/blob/af749bdb4b56ad26ee10d2ea20e2a0c6ce05507d/lua/kickstart/plugins/lspconfig.lua#L166-L193) Unless I missed something, your repo is up to date.