feat: begin adding settings menu, move theme to settings

src/Routes/SettingsSave.c

@@ -0,0 +1,28 @@
+#include "SettingsSave.h"
+#include <stdlib.h>
+#include <string.h>
+
+int settings_save_handler(UrlParams *params) {
+  const char *theme = "";
+  const char *query = "";
+
+  if (params) {
+    for (int i = 0; i < params->count; i++) {
+      if (strcmp(params->params[i].key, "theme") == 0) {
+        theme = params->params[i].value;
+      } else if (strcmp(params->params[i].key, "q") == 0) {
+        query = params->params[i].value;
+      }
+    }
+  }
+
+  if (strlen(theme) > 0) {
+    set_cookie("theme", theme, "Fri, 31 Dec 2038 23:59:59 GMT", "/", false, false);
+  }
+
+  char redirect_url[512];
+  snprintf(redirect_url, sizeof(redirect_url), "/settings?q=%s", query);
+  send_redirect(redirect_url);
+
+  return 0;
+}