[FEAT] Add a disclaimer on the "welcome" tab

tabs/tab0_welcome.py

@@ -13,9 +13,20 @@ def render_tab():
 
     st.markdown(f"""
     <div class='custom-corps'>
+    This tool helps you exploring how to optimize your carbon dioxide removal portfolios by adjusting resource usage and constraints.
+    </div>   
+    <br>  
+    """, unsafe_allow_html=True)   
+
+    st.warning("""
+    While the tool offers multiple customization parameters and allows you to iterate on the results, it can never capture the full nuance and specificity of the resources and their availability in every single country.\n
+    The results of the optimization tool must therefore not be considered as final or complete. Users should use the results as a basis and refine the final CDR portfolios manually to account for the information/context not captured in the model.
+    """,
+    icon=":material/warning:",
+    title="Disclaimer")
 
-    This tool helps you optimize your carbon direct removal portfolio by adjusting resource usage and constraints.
-
+    st.markdown(f"""
+    <div class='custom-corps'>
     <h3 class="wt wt-1">Required:</h3>
     <ol>
         <li><b>Resource inputs</b>: provide the total available quantities of resources for 1 year.</li>