Added link to signin page

app/views/home/auth/signup.phtml

@@ -40,4 +40,8 @@
         <button type="submit">Sign Up</button>
     </form>
 
+</div>
+
+<div class="zone medium text-align-center">
+    <a href="/auth/signin">Already have an account?</a>
 </div>

app/views/home/comps/header.phtml

@@ -1,4 +1,4 @@
-<div class="logo text-align-center">
+<div class="logo text-align-center margin-bottom-xl">
     <a href="/">
         <img src="/images/appwrite.svg" alt="Appwrite Light Logo" class="force-light" />
         <img src="/images/appwrite-footer-dark.svg" alt="Appwrite Dark Logo" class="force-dark" />