refactor: Clarify Private.coffee's mission in web texts

Updated descriptions in 'base.html' and 'simple.html' to better reflect Private.coffee's identity as a privacy-focused non-profit association. The new descriptions emphasize the organization's commitment to privacy and digital sovereignty, aligning more closely with its objectives and activities. This change ensures that website visitors receive a clearer understanding of Private.coffee's mission right from their first interaction, potentially improving engagement and support for its privacy advocacy efforts.

templates/base.html

@@ -92,8 +92,8 @@
               ><span>Private.coffee</span>
             </div>
             <p class="text-muted">
-              Private.coffee is a collection of services that respect your
-              privacy.
+              Private.coffee is a privacy-focused non-profit association, dedicated
+              to supporting privacy and digital sovereignty.
             </p>
           </div>
         </div>

templates/simple.html

@@ -16,7 +16,7 @@
           <li style="padding: 8px 0;"><a style="color: #1a5dab; text-decoration: none;" href="https://element.private.coffee/#/#coffeebreak:private.coffee">#coffeebreak:private.coffee</a> - ☕ Coffee Break ☕ - our off-topic room</li>
         </ul>
         <hr>
-        <p>Private.coffee is a collection of services that respect your privacy, here are some others:</p>
+        <p>Private.coffee operates a collection of services that respect your privacy, here are some others:</p>
         <ul style="list-style: none; padding: 0;">
           {% for service in services.services %}
           {% if not service.exclude_from_simple %}