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docs: Relates to #193. Generate Substrate Interface methods in API docs for RPC, Storage, and Extrinsics from Metadata (#265)

* docs: Relates to #193. Generate Methods in API docs to Substrate Interfaces Extrinsics and Storage from Metadata

* Steps to generate Gitbook:
```
yarn run build:methodsdoc;
yarn run build;
yarn gitbook serve;
```

* Allows generating a docs/METHODS_STORAGE.md and docs/METHODS_EXTRINSICS.md files by running `yarn run build:methodsdoc`
  * Note: The script runs `node packages/types/src/MetadataMdWrapper.js`, which uses Babel.js to transpile the TypeScript file MetadataMd.ts into JavaScript as MetadataMd.js by using the babel-plugin-module-resolver dependency that has been added to package.json. It runs MetadataMd.js, which parses a hard-coded copy of a Metadata response from the Substrate Node, and then generates the two aforementioned Markdown files to be included in the Gitbook.
  * Important Note: DO NOT run `./node_modules/.bin/tsc packages/types/src/MetadataMd.ts; node packages/types/src/MetadataMd.js;`, as doing so may incorrectly transpile other TypeScript files, and will give errors like `TypeError: bn_js_1.default is not a constructor` when you run your unit tests.

* Added links that work when you go to http://localhost:4000/api/ and click the "api" link on the side menu
  * Note: This was achieved by first adding the links in packages/api/README.md (i.e. `[Extrinsics (Substrate Interface)](../METHODS_EXTRINSICS.md)`). Note that the links could also be `METHODS_EXTRINSICS.html` and it would still work. It is VERY important to add links to these Markdown files in docs/SUMMARY.md (i.e. `[Storage](METHODS_STORAGE.md)`), as Gitbook generates HTML files in the same docs/ directory (i.e. it generates docs/METHODS_STORAGE.html) for any links provided in that file, and when you run `yarn run build; yarn gitbook serve` it will put a copy of those HTML files in the _book directory so it can be accessed in the br... (continued)

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