[#158] Fix two Sphinx build warnings

- txt is not a Pygment lexer name. We should use text to indicate no highlighting instead of txt.
- There's no _static directory with static assets, so I removed that from conf.py.

docs/_sources/running_the_program.md.txt

@@ -187,7 +187,7 @@ hlink $ list
 
 To see information about the steps of the task you are currently on, run `get_steps`. You should see something that looks like this:
 
-```txt
+```text
 Link task: Preprocessing
 step 0: register raw dataframes
         Tables used:

docs/running_the_program.html

@@ -200,7 +200,7 @@ <h3>Running Linking Tasks and Steps<a class="headerlink" href="#running-linking-
 </pre></div>
 </div>
 <p>To see information about the steps of the task you are currently on, run <code class="docutils literal notranslate"><span class="pre">get_steps</span></code>. You should see something that looks like this:</p>
-<div class="highlight-txt notranslate"><div class="highlight"><pre><span></span>Link task: Preprocessing
+<div class="highlight-text notranslate"><div class="highlight"><pre><span></span>Link task: Preprocessing
 step 0: register raw dataframes
         Tables used:
         Tables created:

sphinx-docs/conf.py

@@ -56,4 +56,4 @@
 # Add any paths that contain custom static files (such as style sheets) here,
 # relative to this directory. They are copied after the builtin static files,
 # so a file named "default.css" will overwrite the builtin "default.css".
-html_static_path = ["_static"]
+html_static_path = []

sphinx-docs/running_the_program.md

@@ -187,7 +187,7 @@ hlink $ list
 
 To see information about the steps of the task you are currently on, run `get_steps`. You should see something that looks like this:
 
-```txt
+```text
 Link task: Preprocessing
 step 0: register raw dataframes
         Tables used: