feat(markdown): added different colors for each headline (#423)

* feat(markdown)

* change: title1 to blue instead of red.

Markdown notifications will use the color of title1, so we don't want red. Blue is the one we've been using it, so let's keep it.

Also, the title don't deserve so much visual weight, as users will be focusing their attention on the document content instead.

lua/tokyonight/theme.lua

@@ -308,6 +308,14 @@ function M.setup()
     -- NOTE: maybe add these with distinct highlights?
     -- ["@lsp.typemod.variable.globalScope"] (global variables)
 
+    -- Markdown
+    ["@text.title.1.markdown"] = { fg = c.blue, bold = true },
+    ["@text.title.2.markdown"] = { fg = c.yellow, bold = true },
+    ["@text.title.3.markdown"] = { fg = c.green, bold = true},
+    ["@text.title.4.markdown"] = { fg = c.teal, bold = true},
+    ["@text.title.5.markdown"] = { fg = c.magenta, bold = true},
+    ["@text.title.6.markdown"] = { fg = c.purple, bold = true},
+
     -- ts-rainbow
     rainbowcol1 = { fg = c.red },
     rainbowcol2 = { fg = c.yellow },