Here are the rough instructions on what happens each year to drupal

add term for new year to http://akademy.kde.org/admin/structure/taxonomy/akademy_year
configure term alias to be YYYY

add term for new year to http://akademy.kde.org/admin/structure/taxonomy/akademy_news_year
configure term alias to be YYYY/news

set default frontpage to YYYY on http://akademy.kde.org/admin/config/system/site-information

create a new menu called "Main Menu YYYY"

http://akademy.kde.org/admin/structure/menu
 
after typing in the Title a link next to it to edit the machine name appears, this should be set to category-YYYY (menu- is prefixed to what you call it)

enable the menu in menu settings and set the menu to be the default http://akademy.kde.org/admin/structure/types/manage/page

set YYYY in Public file system path http://akademy.kde.org/aode/171/edit?content_lock_token=s25vFTkJlfy125dFo1tYMihzXTnzMoTIDfTFU6MAPL8dmin/config/media/file-system

set DEFAULT VALUE to YYYY

http://akademy.kde.org/admin/structure/types/manage/page/fields/field_akademy_year_page
 
https://akademy.kde.org/admin/structure/types/manage/news/fields/field_akademy_year_news
 
https://akademy.kde.org/admin/structure/types/manage/file/fields/field_akademy_year_file

set DEFAULT VALUE to YYYY http://akademy.kde.org/admin/structure/types/managode/171/edit?content_lock_token=s25vFTkJlfy125dFo1tYMihzXTnzMoTIDfTFU6MAPL8e/news/fields/field_akademy_news_year

header logo is set in http://akademy.kde.org/admin/appearance/settings/neverland and is hardcoded to be in default filesystem location so careful when changing file year

update footer as appropriate http://akademy.kde.org/admin/structure/block/manage/block/1/configure?destination=node/6

add YYYY to http://akademy.kde.org/admin/structure/menu/manage/main-menu

From another task Carl wrote:

I'm not sure that is the problem with T9537 the code for the menu can be found in these three functions:

https://invent.kde.org/carlschwan/neverland/-/blob/master/themes/drupal7/template.php#L101
https://invent.kde.org/carlschwan/neverland/-/blob/master/themes/drupal7/template.php#L138
https://invent.kde.org/carlschwan/neverland/-/blob/master/themes/drupal7/template.php#L179

This is the called from here: https://invent.kde.org/carlschwan/neverland/-/blob/master/themes/drupal7/templates/page.tpl.php#L37

There was an attempt to build an aether drupal theme: https://invent.kde.org/websites/aether-drupal7 and with a preview version of the Akademy website here: https://akademy-dev.kde.org/.

I was hit by a limitation in drupal:

Unable to configure the output of the link in theme_menu_tree I get <li><a href="link">title</a></lI> and we need <li class="nav-item"><a class="nav-link" href="/link">title</a></li> instead to work with bootstrap 4. This completely break the display of the the menu. I tried looking for code in internet but the only Bootstrap 4 theme available for Drupal is a Drupal 8 theme totally incompatible with Drupal 7 sinse it use a new theming API and engine.

Just as an example this is how a modern templating engine would solve the problem: https://invent.kde.org/carlschwan/akademy-kde-org/-/blob/master/layouts/partials/navbar_nav.html