Hey,
I think you're no.1 concern is quite complicated because when a user click "Projekte" he/she will be redirected to http://vocc.de/#projekte. Even if you scroll down, you will still be on that part of the page. So, when you click on a specific portfolio post, the browser will only remember that you are on http://vocc.de/#projekte before you went on that single portfolio post.
No.2 which is a previous and next link for portfolio post is quite doable. Just go to includes folder and open loop-index.php. Find this code
if(has_tag() && is_single())
{
echo '<span class="blog-tags">';
echo the_tags('<strong>'.__('Tags: ','avia_framework').'</strong><span>');
echo '</span></span>';
}
?>
Below put this snippet
<div class='post_nav extralight-border'>
<div class='previous_post_link_align'>
<?php previous_post_link('<span class="previous_post_link">← %link </span><span class="post_link_text">'.__('(previous entry)'))."</span>"; ?>
</div>
<div class='next_post_link_align'>
<?php next_post_link('<span class="next_post_link"><span class="post_link_text">'.__('(next entry)').'</span> %link →</span>'); ?>
</div>
</div> <!-- end navigation -->
You still need to do the styling on your custom.css
Regards,
Ismael