go learning some modern Perl way to do it! go for a Mojolicious or Dancer2 solution. Here I propose you a draft, just a draft, of a Dancer2 solution using TemplateToolkit too; both are worth to know.

You can get a barebone working application running dancer2 -a MyWeb::App (see the project page)

Then you modify config.yaml to use TemplateToolkit (see my example here this was a school project i've done: you can play with it and see other solutions).

Then under /lib you have the perl module where you'll declare your routes: in a very plain simple way I'd procede having a route for the main page, it's associated template to show. Like in:

# draft of the module code

package YourNameApp;
use Dancer2;

# this is the root and will show the index.tt
get '/' => sub {
    template 'index' => { 'title' => 'index: choose an action' };
};
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The above will shows index.tt where the string index: choose an action will be used as the content of the template's variable with name title for example, in index.tt you can have a div showing the title:

<div id="headline">
  <% title %>
</div>
# put here the rest of your HTML, probably a list of link pointing to 
+other routes, like:
# 1) Insert all Apps belonging to a group
# pointing to /ins_all_apps
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Then you add such route to your module:

...

get '/ins_all_apps' => sub {
    # call your own sub that you can put in this same file
    my @results = get_reults_of_ins_all_apps;
    
    # render the appropriate template
    template 'results' => { 'descr' => $resutls[0],
                            'full_text' => $resutls[1] };
};
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Go on.. and have fun!

L*