[fix] remove unmaintained searx/templates/simple/simple.spec.txt

Files hasn't been updated since it initial commit in 2017

Closes: https://github.com/searxng/searxng/issues/723
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

searx/templates/simple/simple.spec.txt

@@ -1,40 +0,0 @@
-#container
-	.search
-		#search_form
-				
-#results
-
-	#sidebar
-		#result-count
-			.title
-			.content
-
-		.infobox	
-			h2
-			img
-			p
-			div#attributes
-				table
-					tbody
-						tr
-							td
-							td
-			div#urls
-				ul
-					li
-
-		#suggestions
-			.title
-			.suggestion
-
-		#search_url
-			.title
-			input
-
-		#apis
-			.title
-			.api-link
-
-	.result
-		
-