Added compactness, Urysohn's lemma, and the Tietze extension theorem.

src/topology/main/index.tex

@@ -10,5 +10,7 @@
 \input{./src/topology/main/product.tex}
 \input{./src/topology/main/hausdorff.tex}
 \input{./src/topology/main/regular.tex}
+\input{./src/topology/main/normal.tex}
+\input{./src/topology/main/compact.tex}
 \input{./src/topology/main/metric.tex}
 \input{./src/topology/main/baire.tex}