Fix sphinx build warnings (no visual changes)

Author: kinow

03-input/index.md

@@ -64,7 +64,7 @@ Final process status is success
 ````
 
 ```{tip}
-## Where did those `/tmp` paths come from?
+<p class="rubric">Where did those `/tmp` paths come from?</p>
 
 The CWL reference runner (cwltool) and other runners create temporary
 directories with symbolic ("soft") links to your input files to ensure that

13-expressions/index.md

@@ -99,7 +99,7 @@ requirements:
 
 ```{admonition} Where are JavaScript expressions allowed?
 
-Just like [parameter references](/_episodes/06-params.md), you can use JavaScript Expressions
+Just like [parameter references](/06-params/index.md), you can use JavaScript Expressions
 only in certain fields.  These are:
 - From [`CommandLineTool`](https://www.commonwl.org/v1.0/CommandLineTool.html#CommandLineTool)
   - `arguments`

22-nested-workflows/index.md

@@ -38,7 +38,7 @@ workflow:
 ```
 
 ```{note}
-## Visualization of the workflow and the inner workflow from its `compile` step
+<p class="rubric">Visualization of the workflow and the inner workflow from its `compile` step</a>
 
 This two-step workflow starts with the `create-tar` step which is connected to
 the `compile` step in orange; `compile` is another workflow, diagrammed on the

index.md

@@ -9,7 +9,8 @@ Hello!
 This guide will introduce you to writing tool wrappers and workflows using the Common Workflow Language (CWL). This guide describes the stable specification, version 1.0. Updates to the guide for more recent versions are ongoing.
 
 ```{note}
-## Contributions and Feedback are Welcome!
+<p class="rubric">Contributions and Feedback are Welcome!</p>
+
 This document is a work in progress. Not all features are covered, yet.
 If you find that something is missing from this guide,
 or if you'd like to provide other feedback,