Update references to login/signup templates

app/routes/auth.py

@@ -16,7 +16,7 @@ def signup():
         db.session.commit()
         flash("Account created successfully. Please log in.", "success")
         return redirect(url_for('auth.login'))
-    return render_template('reading/signup.html', form=form)
+    return render_template('auth/signup.html', form=form)
 
 @auth.route('/login', methods=['GET', 'POST'])
 def login():
@@ -28,7 +28,7 @@ def login():
             flash("Logged in successfully.", "success")
             return redirect(url_for('main.dashboard'))
         flash("Invalid username or password.", "danger")
-    return render_template('reading/login.html', form=form)
+    return render_template('auth/login.html', form=form)
 
 @auth.route('/logout')
 @login_required