Prepare for 'about site' page / add 'root-readme' option to cgitrc

The new option names a file which will be included on a new page, next
to the current 'index' page.

Signed-off-by: Lars Hjemli <hjemli@gmail.com>

cgit.c

@@ -21,6 +21,8 @@ void config_cb(const char *name, const char *value)
 		ctx.cfg.root_title = xstrdup(value);
 	else if (!strcmp(name, "root-desc"))
 		ctx.cfg.root_desc = xstrdup(value);
+	else if (!strcmp(name, "root-readme"))
+		ctx.cfg.root_readme = xstrdup(value);
 	else if (!strcmp(name, "css"))
 		ctx.cfg.css = xstrdup(value);
 	else if (!strcmp(name, "logo"))

cgit.h

@@ -133,6 +133,7 @@ struct cgit_config {
 	char *robots;
 	char *root_title;
 	char *root_desc;
+	char *root_readme;
 	char *script_name;
 	char *virtual_root;
 	int cache_dynamic_ttl;

ui-repolist.c

@@ -136,3 +136,9 @@ void cgit_print_repolist()
 		cgit_print_error("No repositories found");
 	cgit_print_docend();
 }
+
+void cgit_print_site_readme()
+{
+	if (ctx.cfg.root_readme)
+		html_include(ctx.cfg.root_readme);
+}

ui-repolist.h

@@ -2,5 +2,6 @@
 #define UI_REPOLIST_H
 
 extern void cgit_print_repolist();
+extern void cgit_print_site_readme();
 
 #endif /* UI_REPOLIST_H */