bibliography: Remove unused entries

bibliography.bib

@@ -21,26 +21,6 @@
  pagetotal = 248,
  isbn = {0750940255},
 }
-@book{freitagrrr,
- author = {Christian H. Freitag},
- title = {Ritter, Reichsmarschall \& Revoluzzer},
- subtitle = {Aus der Geschichte eines Berliner Landhauses},
- location = {Berlin},
- publisher = {edition Friedenauer Brücke},
- year = 2015,
- pagetotal = 87,
- isbn = {9783981613025},
-}
-@book{lustigerrw,
- author = {Arno Lustiger},
- title = {Rettungswiderstand},
- subtitle = {Über die Judenretter in Europa während der NS-Zeit},
- location = {Göttingen},
- publisher = {Wallstein Verlag},
- year = 2012,
- pagetotal = 462,
- isbn = {9783835321502},
-}
 @article{spörlgl,
  author = {Gerhard Spörl},
  title = {Görings Liste},
@@ -59,14 +39,6 @@
  url = {https://www.timesofisrael.com/top-israeli-honor-eludes-goerings-brother-who-heroically-saved-jews/},
  urldate = {2021-06-26},
 }
-@article{patersongs,
- author = {Tony Paterson},
- title = {Göring’s brother was another Schindler},
- journal = {The Independent},
- date = {2012-04-28},
- url = {https://www.independent.co.uk/news/world/europe/goring-s-brother-was-another-schindler-7687516.html},
- urldate = {2021-06-26},
-}
 @inbook{narareport,
  title = {Goering, Albert},
  author = {Paul Kubala},