[chore]: Update syntax

Harmonizing the syntax files
Now inline comment are a single string instead of a table of strings.

-(language_c): Removed whitespaces breaking indent
-(language_html): Removed trailing whitespace

data/plugins/language_css.lua

@@ -7,7 +7,7 @@ syntax.add {
   block_comment = { "/*", "*/" },
   patterns = {
     { pattern = "\\.",                type = "normal"   },
-    { pattern = "//.-\n",             type = "comment"  },
+    { pattern = "//.*$",              type = "comment"  },
     { pattern = { "/%*", "%*/" },     type = "comment"  },
     { pattern = { '"', '"', '\\' },   type = "string"   },
     { pattern = { "'", "'", '\\' },   type = "string"   },