get rid of unused files in assets.

rather than using the HKA logo as a image i used svg version.
For this I gathered the SVG from the respective HKA website. the horizontal logo is reverse engineered to "look-alike" the horizontal HKA logo. (TBH I am not sure if this logo is still officially used, I could not find it on the official website, beside in a short video: https://youtu.be/gmIdmSL8kbk?si=ICvoxyhw22HvNQEx&t=28 and in some shared documents by others from the HKA.
SVG versions scale better than PNG and reduce the pdf storage size.
Also added the logo to the README.md so that its easier recogniseable for students.

README.md

@@ -1,6 +1,8 @@
+![HKA Logo](./template/logo/hka_horizontal.svg)
+
 # Typst Template HKA
 
-This is a thesis template written in [Typst](https://typst.app/), 
+This is a thesis template written in [Typst](https://typst.app/),
 based on the [template of the TU Munich](https://github.com/ls1intum/thesis-template-typst).
 
 ## Usage
@@ -47,7 +49,7 @@ In the intranet you can download the official titlepage. As Typst is not able to
 Every header includes the heading of the current chapter, section or subsection.
 ![Current Subsection](assets/image.png)
 
-If a new section or subsection starts at the current page this one is chosen. 
+If a new section or subsection starts at the current page this one is chosen.
 ![New Section](assets/image-1.png)
 
 If a new chapter starts at the current page, no header will be shown.
@@ -63,4 +65,4 @@ Every footer is divided by a line from the main body. The footer contains the pa
 
 **Anything Missing?** Please [create an issue](https://github.com/AnsgarLichter/unofficial-hka-thesis/issues/new) or open a Pull Request right away.
 
-**Have Questions?** Please [open a discussion](https://github.com/AnsgarLichter/unofficial-hka-thesis/discussions).
+**Have Questions?** Please [open a discussion](https://github.com/AnsgarLichter/unofficial-hka-thesis/discussions).