<form method=”post” action=”<?php bloginfo(‘url’); ?>/customsearch.php” class=”search-form” role=”search”> … </form> customsearch.php in content : http://pastebin.com/mxVPphXa customsearch.php should be here: yoursite.com/dir/customsearch.php
index.php is the default template, the fallback. If we look here: http://codex.wordpress.org/Template_Hierarchy And at the diagram: We can see here that search.php is the appropriate template. Have you considered using author.php and the author archives instead of modifying the search template? There are far better ways of implementing what you want, even the searching via … Read more
Remove the following line from your $args array: ‘post_type’=> ‘post’, Or change it to: ‘post_type’=> ‘any’, This is only running the query on posts and will not work on pages. The following explains this in more detail: https://wordpress.org/support/article/post-types/
I would take that shortcode out, go to Admin -> Settings -> Reading, set “Front Page displays your latest posts”, and set “Blog pages show at most 15 posts”.
Limiting number of visible links displayed with wp_link_pages
Adding range to wp_link_pages()
Pagination w/Static Front Page
Pagination customization
Using Ajax in the prev_posts_link and next_posts_link
make a pagination that show posts by date