cleaned up CSS and migrated to Bootstrap

pom.xml

src/main/webapp/WEB-INF/jsp/header.jsp

src/main/webapp/WEB-INF/jsp/owners/form.jsp

src/main/webapp/WEB-INF/jsp/owners/list.jsp

src/main/webapp/WEB-INF/jsp/owners/search.jsp

src/main/webapp/WEB-INF/jsp/owners/show.jsp

src/main/webapp/WEB-INF/jsp/pets/form.jsp

src/main/webapp/WEB-INF/jsp/pets/visitForm.jsp

src/main/webapp/WEB-INF/jsp/vets.jsp

src/main/webapp/WEB-INF/jsp/welcome.jsp

src/main/webapp/WEB-INF/petclinic-servlet.xml

src/main/webapp/WEB-INF/spring/applicationContext-jdbc.xml

src/main/webapp/resources/css/petclinic.css

src/main/webapp/resources/styles/petclinic.css