nvim: after/plugin/nvim-lint: Drop languagetool & vale

Both seem to give errors at the moment. While at it, drop the unused
flake8 args setting.

nvim/.config/nvim/after/plugin/nvim-lint.lua

@@ -8,12 +8,8 @@ nvim_lint.linters_by_ft = {
   haskell    = { 'hlint' },
   javascript = { 'eslint' },
   lua        = { 'luacheck' },
-  markdown   = { 'vale', 'languagetool' },
   python     = { 'pylint', 'mypy' },
   sh         = { 'shellcheck' },
   typescript = { 'eslint' },
-  text       = { 'vale', 'languagetool' },
   yaml       = { 'yamllint' },
 }
-
-nvim_lint.linters.flake8.args = { '--ignore', 'E133,E501,W503' }