apps: rename 'search' to 'duckduckgo'

just in case we want to bring in a 'real' search app like e.g.
the one in wercchan, for which see
https://github.com/kfarwell/werchan/tree/master/apps/search

apps/duckduckgo/HOWTO

@@ -3,7 +3,7 @@ that default, you could enable site search like so:
 
 
 mkdir -p /www/werc/sites/MYSITE/_search/_werc/
-echo 'conf_enable_search' > /www/werc/sites/MYSITE/_search/_werc/config
+echo 'conf_enable_duckduckgo' > /www/werc/sites/MYSITE/_search/_werc/config
 mkdir -p /www/werc/sites/MYSITE/_werc/lib/
 cp /www/werc/apps/search/footer.inc.sample /www/werc/sites/MYSITE/_werc/lib/
 

apps/duckduckgo/app.rc

@@ -1,22 +1,22 @@
-fn conf_enable_search {
-    enable_search=yes
-    conf_enable_app search
+fn conf_enable_duckduckgo {
+    enable_duckduckgo=yes
+    conf_enable_app duckduckgo
 		pageTitle='Site Search'
 }
 
 
-fn search_init {
+fn duckduckgo_init {
 	get_post_args q
 	if (! ~ $#q 0) {
 		redirect_string = 'https://duckduckgo.com/?q=site:'$SERVER_NAME^'+'^$"q
 		http_redirect $redirect_string '302 Found'
 	}
 	if not {
-		handler_body_main='search_body'
+		handler_body_main='duckduckgo_body'
 	}
 }
 
-fn search_body {
+fn duckduckgo_body {
     echo '
 <h1>Site search</h1>
 <h3>using DuckDuckGo</h3>