[Bug]: Replace Null-Ls with alternatives

[Jarmos-san]

Explain the Bug

Null-Ls is unmaintained and the repository is archived (see the official notice) which means there is chance that things might break in the near future. While the plugin worked great for the time being, Neovim will sooner or later gradually implement much of the features of null-ls into core (see the list of PRs on the topic).

Hence, it might be better to gradually replace features provided by null-ls with alternatives. To start with here is a list of alternatives;

• mfussenegger/nvim-lint to lint the buffer contents using a linter.
• See this Reddit thread to learn about an easy and quick Neovim command to format the contents of the buffer using some tools.

More such alternatives will be listed here as and when I come across any...

Relevant log output

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