Problem: Code Reference docs hidden in appendices (#2473)

Solution: Move the Code Reference docs into their own section

docs/server/source/appendices/index.rst

@@ -11,9 +11,6 @@ Appendices
 
    json-serialization
    cryptography
-   the-bigchaindb-class
-   backend
-   commands
    aws-setup
    generate-key-pair-for-ssh
    firewall-notes

docs/server/source/code-reference/index.rst

@@ -0,0 +1,24 @@
+
+.. Copyright BigchainDB GmbH and BigchainDB contributors
+   SPDX-License-Identifier: (Apache-2.0 AND CC-BY-4.0)
+   Code is Apache-2.0 and docs are CC-BY-4.0
+
+Code Reference
+==============
+
+This section contains auto-generated documentation of various functions, classes and methods
+in the BigchainDB Server code, based on Python docstrings in the code itself.
+
+.. warning::
+
+   While we try to keep docstrings accurate,
+   if you want to know *for sure* what the code does,
+   then you have to read the code itself.
+
+.. toctree::
+   :maxdepth: 1
+
+   the-bigchaindb-class
+   backend
+   commands
+   

docs/server/source/index.rst

@@ -23,4 +23,5 @@ BigchainDB Server Documentation
    data-models/index
    k8s-deployment-template/index
    release-notes
+   code-reference/index
    appendices/index