Improve base configuration for `neovim`: * [`lsp`] Configure `gopls` * [`lsp`] Update `openapi` schema reference * [`colorscheme`] Update `gruvbox-material` configuration Add new `mcp` servers: * `github` * `memoby-bank` * `sequential-thinking` Reviewed-on: #283 Co-authored-by: Joao P Dubas <joao.dubas+gitea@gmail.com> Co-committed-by: Joao P Dubas <joao.dubas+gitea@gmail.com>