update table of contents and reference

Author: keiyamamo

docs/_toc.yml

@@ -15,6 +15,7 @@ parts:
   - caption: Using VaSP
     chapters:
     - file: preprocess
+    - file: prestress
     - file: simulation
     - file: postprocess
     - file: features

docs/references.bib

@@ -105,4 +105,17 @@ @article{Bruneau2023
 title = {{Understanding intracranial aneurysm sounds via high-fidelity fluid-structure-interaction modelling}},
 volume = {3},
 year = {2023}
-}
+}
+
+@article{Hsu2011,
+author = {Hsu, Ming Chen and Bazilevs, Yuri},
+doi = {10.1016/j.finel.2010.12.015},
+issn = {0168874X},
+journal = {Finite Elements in Analysis and Design},
+number = {6},
+pages = {593--599},
+publisher = {Elsevier},
+title = {{Blood vessel tissue prestress modeling for vascular fluid-structure interaction simulation}},
+volume = {47},
+year = {2011}
+}