nvim: Exchange headlines plugin for markdown.nvim

To render markdown highlights and a few other things (list items, code
blocks, callouts, etc) we switched from headlines.nvim to markdown.nvim
(internally ralled render-markdown).
This now also enables quick switching between showing the rendered
output and raw markdown (`<leader>pp`).

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

@@ -40,12 +40,24 @@ local prose_plugs = {
 			},
 		},
 	},
-	-- displays prettier headlines mimicking the ones in emacs orgmode
+	-- displays prettier md rendering
 	{
-		"lukas-reineke/headlines.nvim",
-		dependencies = "nvim-treesitter/nvim-treesitter",
-		config = true,
+		"MeanderingProgrammer/markdown.nvim",
+		main = "render-markdown",
+		opts = {},
+		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,
+		keys = {
+			{
+				"<leader>pp",
+				function()
+					require("render-markdown").toggle()
+				end,
+				silent = true,
+				desc = "toggle md rendering",
+			},
+		},
 	},
 	-- generate an auto-updating html preview for md files
 	-- uses the very nice peek if deno is available, otherwise falls back to markdown-preview
@@ -84,7 +96,7 @@ local prose_plugs = {
 		},
 		cmd = { "PasteImage" },
 		keys = {
-			{ "<leader>pp", "<cmd>PasteImage<cr>", desc = "Paste image from system clipboard" },
+			{ "<leader>pi", "<cmd>PasteImage<cr>", desc = "Paste image from system clipboard" },
 		},
 		ft = writing_ft,
 	},
@@ -184,6 +196,7 @@ local prose_plugs = {
 		"barreiroleo/ltex_extra.nvim",
 		branch = "dev",
 	},
+	{ "let-def/texpresso.vim", ft = { "tex" } },
 }
 
 return prose_plugs