Track widdershins version

Add `package.json` to track and run `widdershins` (version guessed from
history, not using the latest).
Update dependabot config to also update the npm packages.
Update readme to match latest changes.
The `apis.md` was not yet regenerated, pending update of the
definition.

Signed-off-by: thc202 <thc202@gmail.com>

.github/dependabot.yml

@@ -5,4 +5,9 @@ updates:
   schedule:
     interval: weekly
   open-pull-requests-limit: 10
+- package-ecosystem: npm
+  directory: "/"
+  schedule:
+    interval: weekly
+  open-pull-requests-limit: 10
 

README.md

@@ -32,7 +32,7 @@ node package is used to auto generate the markdown file.
 
 ```bash
 # To install the widdershins package
-npm i -g widdershins
+npm install
 # To generate the markdown file
-widdershins --search false --language_tabs 'shell:Shell' 'java:Java' 'python:Python' --summary openapi.yaml source/includes/apis.md
+npm run build
 ```