Some options need to be set for both vim.bo (for the current buffer) and
vim.o (for newly opened buffers). This is required till the below PR
gets merged.
https://github.com/neovim/neovim/pull/13479
Not sure what changed in recent releases for either nvim, packer or
lspconfig plugins, but, our custom LSP configuration file seems to
not be loaded or have any effect when specified via packer's config
directive. So load it manually in init.