fix: small bibliography correction

bibliography/references.bib

@@ -4,22 +4,3 @@
 % proposed label naming convention: "chapter.subchapter-descriptive_name"
 % for example: "2.2.2-why-gpg-is-awesome"
 
-@article{einstein,
-  author =       "Albert Einstein",
-  title =        "{Zur Elektrodynamik bewegter K{\"o}rper}. ({German})
-                 [{On} the electrodynamics of moving bodies]",
-  journal =      "Annalen der Physik",
-  volume =       "322",
-  number =       "10",
-  pages =        "891--921",
-  year =         "1905",
-  DOI =          "http://dx.doi.org/10.1002/andp.19053221004"
-}
-
-@book{latexcompanion,
-    author    = "Michel Goossens and Frank Mittelbach and Alexander Samarin",
-    title     = "The \LaTeX\ Companion",
-    year      = "1993",
-    publisher = "Addison-Wesley",
-    address   = "Reading, Massachusetts"
-}

examples-page.tex

@@ -1,7 +1,3 @@
-Some text and the a cite\cite{einstein}.
-
-And another cite\cite{latexcompanion}.
-
 This is a list:
 \begin{itemize}
     \item item 1

packages.tex

@@ -12,7 +12,7 @@
 % Paper size and margins
 \usepackage{geometry}
 
-\usepackage{biblatex}
+\usepackage[backend=bibtex, sorting=none]{biblatex}
 \usepackage{csquotes}
 \usepackage{listings}	% Typeset source code listings