Do not set default excluded buftypes, make it fully opt in

Author: MeanderingProgrammer

Diff for: README.md

@@ -162,7 +162,7 @@ require('render-markdown').setup({
     render_modes = { 'n', 'c' },
     exclude = {
         -- Buftypes ignored by this plugin, see :h 'buftype'
-        buftypes = { 'nofile' },
+        buftypes = {},
     },
     latex = {
         -- Whether LaTeX should be rendered, mainly used for health check

Diff for: doc/render-markdown.txt

@@ -199,7 +199,7 @@ Full Default Configuration ~
         render_modes = { 'n', 'c' },
         exclude = {
             -- Buftypes ignored by this plugin, see :h 'buftype'
-            buftypes = { 'nofile' },
+            buftypes = {},
         },
         latex = {
             -- Whether LaTeX should be rendered, mainly used for health check

Diff for: lua/render-markdown/init.lua

@@ -156,7 +156,7 @@ M.default_config = {
     render_modes = { 'n', 'c' },
     exclude = {
         -- Buftypes ignored by this plugin, see :h 'buftype'
-        buftypes = { 'nofile' },
+        buftypes = {},
     },
     latex = {
         -- Whether LaTeX should be rendered, mainly used for health check