Making the website HTML4.01-compliant

docs/contact.html

docs/download.html

docs/faq.html

docs/index.html

docs/news.html

docs/tutorial/Architecture.html

docs/tutorial/Configuration.html

docs/tutorial/Documentation.html

docs/tutorial/Execution.html

docs/tutorial/Implementation.html

docs/tutorial/Installation.html

docs/tutorial/Models.html

docs/tutorial/Project.html

docs/tutorial/Tools.html

docs/tutorial/tuti.html