rework of index page; add icons

Issue-ID: DOC-798

Signed-off-by: thmsdt <thomas.kulik@telekom.de>
Change-Id: Icebb12289c67e064e0d948d857cc65ff2444d5b1
diff --git a/docs/_static/terminal.svg b/docs/_static/terminal.svg
new file mode 100644
index 0000000..e12c9f8
--- /dev/null
+++ b/docs/_static/terminal.svg
@@ -0,0 +1,4 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-terminal" viewBox="0 0 16 16">
+  <path d="M6 9a.5.5 0 0 1 .5-.5h3a.5.5 0 0 1 0 1h-3A.5.5 0 0 1 6 9zM3.854 4.146a.5.5 0 1 0-.708.708L4.793 6.5 3.146 8.146a.5.5 0 1 0 .708.708l2-2a.5.5 0 0 0 0-.708l-2-2z"/>
+  <path d="M2 1a2 2 0 0 0-2 2v10a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V3a2 2 0 0 0-2-2H2zm12 1a1 1 0 0 1 1 1v10a1 1 0 0 1-1 1H2a1 1 0 0 1-1-1V3a1 1 0 0 1 1-1h12z"/>
+</svg>
\ No newline at end of file