add: documentation

app/src/app.js

@@ -7,6 +7,7 @@ const app = express();
 // specifying the folder with the static content - html+css
 app.use(express.static(__dirname + '/static'));
 
+// root route, serving the czech version by default
 app.get('/', (req, res) => {
     res.sendFile(path.join(__dirname, '/static/cs/index.html'));
 });
@@ -15,6 +16,7 @@ app.get('/en', (req, res) => {
     res.sendFile(path.join(__dirname, '/static/en/index.html'));
 });
 
+// the search route serves the czech language by default
 app.get('/search', (req, res) => {
     handleSearch(req, res, "cz-CS");
 });

app/src/search.js

@@ -20,7 +20,7 @@ async function handleSearch(req, res, lang) {
             q: query,
             engines: "startpage",
             format: "json",
-            category_general: 1,
+            category_general: 1, // this is needed for an accurate language choice by searx.ng
             language: lang
         }); 
         console.log(`${searxngUrl}/search?${params}`);