fixing more broken links

Author: mattmakai

content/pages/03-data/18-data-visualization.markdown

@@ -91,11 +91,6 @@ Sometimes you need inspiration from other sources to figure out what
 you want to build. The following links have made me excited about data
 visualization and gave me ideas for what to build.
 
-* [Roads to Rome](http://roadstorome.moovellab.com/) is a beautiful
-  visualization showing the data behind the expression "all roads lead 
-  to Rome" and whether or not there is a "Rome" central city in every 
-  country.
-
 * [Monarchs](https://thebackend.dev/monarchs/) is a wonderful 1,000 year
   history visual of European rulers. The developer also wrote an in-depth
   article on 

content/pages/examples/flask/flask-example-projects-code.markdown

@@ -99,7 +99,7 @@ is configured in JSON. The code is provided as open source under the
 is an example application that ties together the 
 [intTellInput.js](https://github.com/jackocnr/intl-tel-input)
 JavaScript plugin with the 
-[Flask-WTF](https://flask-wtf.readthedocs.io/en/stable/) form-handling 
+[Flask-WTF](https://flask-wtf.readthedocs.io/) form-handling 
 library. flask-phone-input is provided as open source under the
 [MIT license](https://github.com/miguelgrinberg/flask-phone-input/blob/1a1c227c044474ce0fe133493d7f8b0fb8312409/LICENSE).
 

content/pages/examples/sqlalchemy/sqlalchemy-exc-integrityerror.markdown

@@ -142,7 +142,7 @@ libraries that are commonly used in Flask projects, such as
 [SendGrid](https://www.twilio.com/sendgrid) for transactional email,
 [SQLAlchemy](/sqlalchemy.html) for persistent data storage through a
 [relational database](/databases.html) backend,
-[Flask-WTF](https://flask-wtf.readthedocs.io/en/stable/) for form
+[Flask-WTF](https://flask-wtf.readthedocs.io/) for form
 handling and many others.
 
 flask-base is provided as open source under the