Add markdownlint as linter and formatter

resolves #8

config/nvim/lua/aleidk/plugins/formatter.lua

@@ -19,6 +19,7 @@ return {
 			scss = { { "prettierd", "prettier" } },
 			html = { "prettierd" },
 			sh = { "shfmt" },
+			markdown = { "markdownlint" },
 			-- Use the "_" filetype to run formatters on filetypes that don't
 			-- have other formatters configured.
 			["_"] = { "trim_whitespace" },

config/nvim/lua/aleidk/plugins/linters.lua

@@ -17,6 +17,7 @@ return {
 			sh = { "shellcheck" },
 			NeogitCommitMessage = { "gitlint" },
 			gitcommit = { "gitlint" },
+			markdown = { "markdownlint" },
 		}
 
 		vim.api.nvim_create_autocmd({ "BufWritePost" }, {

config/nvim/lua/aleidk/plugins/mason.lua

@@ -7,6 +7,7 @@ return {
 			"stylua",
 			"blue",
 			"prettierd",
+			"markdownlint",
 		},
 	},
 }