docs(website): fix license reference

This commit fixes a regression introduced in 5f55d6a (docs(website): update
content to match new api ) updating the text describing the license to mention
"Apache License Version 2.0" instead of "BSD-3".

The text now described the license effectively associated with the trame v2
project originally introduced in 0e44015 (trame a framework to write ubiquitous
applications in Python).

For reference, trame v1 license  (originally introduced in e8fe594
(chore: Getting started)) was BSD-3.

docs/content/index.pug

@@ -219,7 +219,7 @@ ul#intro-feature-list(style="padding-top: 50px;")
         a(href="https://pypi.org/project/trame/").link Open Source
       p.intro-feature-desc
         b trame 
-        | is an open source project licensed under BSD-3 which allows users to create
+        | is an open source project licensed under Apache License Version 2.0 which allows users to create
         | open source or commercial applications without any licensing worries.
 
   li.intro-feature-wrap(style="padding-top: 0;")