Resolve "Subsite: Software Engineering Consulting Manual"

Closes #350 (closed)

• consulting.html to consulting.md (not feasible)
• Create a specific folder for consulting /consulting-materials/handbook/
• Add link in an existing/non-existing page
• Add /consulting-materials/index.md with some content (if not done on the initial page before) (no extra page required)
• Mark each folder with at least a file .gitkeep
• Adjust fetch_external_content.sh to include the external build *.html site
• Add /consulting-handbook/ to include .gitignore

services/software/consulting.html

@@ -109,7 +109,24 @@ excerpt: >-
 
 <div class="image-attrib">Images by Katerina Limpitsouni via <a href="https://undraw.co/">undraw.co</a></div>
 
-<h1>Getting Started</h1>
+<h2> Handbook </h2>
+
+<p>
+    For a more in-depth look at the consulting process, please have a look at our 
+    <a href={{ "consulting-handbook/" | relative_url }}>HIFIS Consulting Handbook</a>.
+    It provides information on the process and the corresponding services we use for a successful consultation.
+</p>
+
+<h2> Helpful Resources </h2>
+
+<p>
+    The awesome-rse list is a curated awesome list of resources for Research Software Engineering (RSE). The list contains
+    various tools and process recommendations that maybe made to the client.
+    <br><br>
+    <a href="https://github.com/hifis-net/awesome-rse">https://github.com/hifis-net/awesome-rse</a>.
+</p>
+
+<h2>Getting Started</h2>
 
 <p>
     You can request a new consultation by using the link below.
@@ -121,4 +138,5 @@ excerpt: >-
 
 <p>
     If anything goes wrong during the process, feel free to <a href="mailto:{{site.contact_mail}}">email us</a> directly.
-</p>
\ No newline at end of file
+</p>
+