Update header and index page

Update the visibility of the GitHub icon in the header to be displayed on smaller screens. Change the text on the Index page from "Eleve seu nível de desenvolvimento" to "Conheça nossas ferramentas".

Author: lovable-dev[bot]

src/components/Header.tsx

@@ -89,7 +89,6 @@ const Header = () => {
               {theme === "dark" ? <Sun className="w-4 h-4" /> : <Moon className="w-4 h-4" />}
             </Button>
             <Button
-              className="hidden xs:flex"
               variant="ghost"
               size="icon"
               onClick={() => window.open("https://github.com/devitools", "_blank")}

src/pages/Index.tsx

@@ -25,7 +25,7 @@ const Index = () => {
           </div>
 
           <h1 className="text-5xl md:text-7xl font-bold mb-6 bg-gradient-hero bg-clip-text text-transparent leading-tight">
-            Eleve seu nível de desenvolvimento
+            Conheça nossas ferramentas
           </h1>
 
           <p className="text-xl md:text-2xl text-muted-foreground m-8 max-w-3xl mx-auto">