Carlos Calla Alarcón

Update remaining occurrences of Mason's old address to point to the new address. Previous PR about this update: https://github.com/nvim-lua/kickstart.nvim/pull/1516

docs(readme): update mappings examples

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## Description The example mappings, which most likely are the ones used by default for the majority of users, map the `s` in these modes: `{ 'n', 'x', 'o' }`....

- Updates deprecated `vim` api usages. - Replaces `vim.loop` for `vim.uv`. - Replaces `vim.api.nvim_buf_add_highlight` for `vim.api.nvim_buf_set_extmark`.

Adding basic support for `nvim-web-devicons` I'm open to any suggestions for improvements. Currently, it will autodetect if `nvim-web-devicons` package is available and load it to use it, otherwise it works...