Docs: Added node.js page, fixed typos in Python page.

src/site/markdown/analyzers/nodejs.md

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+Node.js Analyzer
+================
+
+OWASP dependency-check includes an analyzer that will scan [Node Package Manager](https://www.npmjs.com/)
+package specification files. The analyzer(s) will collect as much information
+it can about the package. The information collected is internally referred to
+as evidence and is grouped into vendor, product, and version buckets. Other
+analyzers later use this evidence to identify any Common Platform Enumeration
+(CPE) identifiers that apply.
+
+__Note:__ Also consider using the Node Security Project auditing tool,
+[nsp](https://nodesecurity.io/tools).
+
+Files Types Scanned: [package.json](https://docs.npmjs.com/files/package.json)