Terms of use: Specify requirement to use resources for Apertis

We have had a instance of an external Apertis account holder using the
Apertis resources for unrelated, non-Apertis, uses. Add a clause to the
terms of use to make it clearer that this is not allowed.

Signed-off-by: Martyn Welch <martyn.welch@collabora.com>

content/policies/terms_of_use.md

@@ -2,6 +2,7 @@
 date = "2021-04-05"
 weight = 100
 toc = true
+lastmod = 2024-06-05
 
 title = "Terms of Use"
 
@@ -48,7 +49,7 @@ your use of our site:
 
 We amend these terms from time to time. Every time you wish to use our site,
 please check these terms to ensure you understand the terms that apply at that
-time. These terms were most recently updated on 5 April 2021.
+time. These terms were most recently updated on 5 June 2024.
 
 # WE MAY MAKE CHANGES TO OUR SITE
 
@@ -182,6 +183,8 @@ You may use our site only for lawful purposes.  You may not use our site:
 
 You also agree:
 
+- To only use the resources provided by Apertis.org, such as the Apertis GitLab
+  instance, in conjunction with activities linked to the Apertis project.
 - Not to reproduce, duplicate, copy or re-sell any part of our site in
   contravention of the provisions in these terms of use and the relevant
   materials licensing.