Update content of (hard-coded) FAQ answers on landing page (#663)

The answers regarding volume coupling and adapter best practices were previously outdated.

Author: MakisH

content/index.html

@@ -440,8 +440,8 @@ <h2 class="section-header">Frequently asked questions (FAQ)</h2>
               <strong>Can preCICE be used for volume coupling?</strong>
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-              <p>Yes, but it will be computationally expensive. preCICE is mainly designed to couple simulations that share ...</p>
-              <a class="no-icon" href="https://precice.discourse.group/t/can-precice-be-used-for-volume-coupling/27/2">Learn more &nbsp;<i class="fas fa-chevron-right"></i></a>
+              <p>Yes. In preCICE v3 there have been many changes and improvements regarding large meshes. The following has ...</p>
+              <a class="no-icon" href="https://precice.discourse.group/t/can-precice-be-used-for-volume-coupling/27/9">Learn more &nbsp;<i class="fas fa-chevron-right"></i></a>
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@@ -451,8 +451,8 @@ <h2 class="section-header">Frequently asked questions (FAQ)</h2>
               <strong>What are best practices to write a new adapter?</strong>
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-              <p>I wanted to ask if there are some additional guidelines on how to write good adapters for preCICE. I have the feeling that ...</p>
-              <a class="no-icon" href="https://precice.discourse.group/t/what-are-best-practices-to-write-a-new-adapter/44">Learn more &nbsp;<i class="fas fa-chevron-right" ></i></a>
+              <p>There are <a href="community-guidelines-adapters.html">guidelines for adapters</a>, as well as for <a href="community-guidelines-application-cases.html">application cases</a>, as part of the ecosystem standardization ...</p>
+              <a class="no-icon" href="https://precice.discourse.group/t/what-are-best-practices-to-write-a-new-adapter/44/3">Learn more &nbsp;<i class="fas fa-chevron-right" ></i></a>
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