Remove all remaining "$ " prefixes from docs, closes #2140

Also document sqlite-utils create-view

docs/contributing.rst

@@ -133,13 +133,19 @@ Running Black
 
 Black will be installed when you run ``pip install -e '.[test]'``. To test that your code complies with Black, run the following in your root ``datasette`` repository checkout::
 
-    $ black . --check
+    black . --check
+
+::
+
     All done! ✨ 🍰 ✨
     95 files would be left unchanged.
 
 If any of your code does not conform to Black you can run this to automatically fix those problems::
 
-    $ black .
+    black .
+
+::
+
     reformatted ../datasette/setup.py
     All done! ✨ 🍰 ✨
     1 file reformatted, 94 files left unchanged.
@@ -160,11 +166,14 @@ Prettier
 
 To install Prettier, `install Node.js <https://nodejs.org/en/download/package-manager/>`__ and then run the following in the root of your ``datasette`` repository checkout::
 
-    $ npm install
+    npm install
 
 This will install Prettier in a ``node_modules`` directory. You can then check that your code matches the coding style like so::
 
-    $ npm run prettier -- --check
+    npm run prettier -- --check
+
+::
+
     > prettier
     > prettier 'datasette/static/*[!.min].js' "--check"
 
@@ -174,7 +183,7 @@ This will install Prettier in a ``node_modules`` directory. You can then check t
 
 You can fix any problems by running::
 
-    $ npm run fix
+    npm run fix
 
 .. _contributing_documentation:
 
@@ -322,10 +331,17 @@ Upgrading CodeMirror
 
 Datasette bundles `CodeMirror <https://codemirror.net/>`__ for the SQL editing interface, e.g. on `this page <https://latest.datasette.io/fixtures>`__. Here are the steps for upgrading to a new version of CodeMirror:
 
+* Install the packages with::
 
-* Install the packages with `npm i codemirror @codemirror/lang-sql`
-* Build the bundle using the version number from package.json with:
+    npm i codemirror @codemirror/lang-sql
 
-    node_modules/.bin/rollup datasette/static/cm-editor-6.0.1.js -f iife -n cm -o datasette/static/cm-editor-6.0.1.bundle.js -p @rollup/plugin-node-resolve -p @rollup/plugin-terser
+* Build the bundle using the version number from package.json with::
 
-* Update version reference in the `codemirror.html` template
+    node_modules/.bin/rollup datasette/static/cm-editor-6.0.1.js \
+      -f iife \
+      -n cm \
+      -o datasette/static/cm-editor-6.0.1.bundle.js \
+      -p @rollup/plugin-node-resolve \
+      -p @rollup/plugin-terser
+
+* Update the version reference in the ``codemirror.html`` template.