replace deprecated classes, update code, fix errors, add missing stuff

docs/template.typ

@@ -0,0 +1,100 @@
+// The project function defines how your document looks.
+// It takes your content and some metadata and formats it.
+// Go ahead and customize it to your liking!
+#let project(title: "", subtitle: "", authors: (), logo: none, body) = {
+
+  // Set the document's basic properties.
+  set document(author: authors, title: title)
+  set text(font: "Linux Libertine", lang: "de")
+  set heading(numbering: "1.1")
+
+  set align(center)
+
+  // Title page.
+  v(1fr)
+  
+  // Logo
+  if logo != none {
+    image(logo, width: 50%)
+  }
+  v(3em)
+
+  // Title
+  text(2em, weight: 700, title)
+
+  linebreak()
+  v(0.1em)
+
+  // Subtitle
+  text(2em, weight: 400, subtitle)
+  
+  v(1em)
+
+  // Author
+  grid(
+    ..authors,
+  )
+
+  v(1fr)
+  pagebreak()
+
+  set align(left)
+
+  set page(numbering: "I", number-align: center)
+
+  let ht-first = state("page-first-section", [])
+  let ht-last = state("page-last-section", [])
+
+  set page(
+    header: {
+      locate(loc => {
+          // find first heading of level 1 on current page
+          let first-heading = query(
+            heading.where(level: 1), loc)
+            .find(h => h.location().page() == loc.page())
+          // find last heading of level 1 on current page
+          let last-heading = query(
+            heading.where(level: 1), loc)
+            .rev()
+            .find(h => h.location().page() == loc.page())
+          // test if the find function returned none (i.e. no headings on this page)
+          {
+            if not first-heading == none {
+              ht-first.update([
+                // change style here if update needed section per section
+                #first-heading.body
+              ])
+              ht-last.update([
+                // change style here if update needed section per section
+                #last-heading.body
+              ])
+
+              // if one or more headings on the page, use first heading
+              // change style here if update needed page per page
+              ht-first.display()
+            } else {
+              // no headings on the page, use last heading from variable
+              // change style here if update needed page per page
+              ht-last.display()
+            }
+          }
+        }
+      )
+
+      v(-0.8em)
+      line(length: 100%, stroke: 0.5pt)
+    }
+  )
+  
+  // Table of contents
+  outline(depth: 3, indent: true)
+  pagebreak()
+  
+  set page(numbering: "1")
+  counter(page).update(1)
+
+  // Main body
+  set par(justify: true)
+
+  body
+}