nvim: Improve markdown rendering

Remove redundant conceallevel fix (not required for quarto files
anymore), add additional filetype injections and do not highlight
codeblocks as much (no sign colum entry, bg not over whole doc width).

nvim/.config/nvim/lua/plugins/prose.lua

@@ -42,22 +42,20 @@ local prose_plugs = {
 	},
 	-- displays prettier md rendering
 	{
-		"MeanderingProgrammer/markdown.nvim",
+		"MeanderingProgrammer/render-markdown.nvim",
 		main = "render-markdown",
 		opts = {
-			file_types = { "markdown", "quarto", "pandoc", "vimwiki" },
-			win_options = {
-				conceallevel = {
-					rendered = 2,
-				},
-			},
-			heading = {
-				width = "block",
+			file_types = { "markdown", "quarto", "pandoc", "vimwiki", "norg", "rmd", "org" },
+            code = {
+                sign = false,
+                width = 'block',
+                right_pad = 1,
             },
 		},
 		name = "render-markdown", -- Only needed if you have another plugin named markdown.nvim
 		dependencies = { "nvim-treesitter/nvim-treesitter", "nvim-tree/nvim-web-devicons" }, -- if you prefer nvim-web-devicons
 		ft = writing_ft,
+		cmd = "RenderMarkdown",
 		keys = {
 			{
 				"<leader>pp",