New documentation setup (#1708)

* initial docsite setup

* switch from pushd to cd

* install and set up solidity-docgen

* use the docsite branch next for now

* make it clear that env var is a repository

* add a clarifying comment about a relative path

* change relative to absolute path in docsite script

* add docgen script

* add first few READMEs for contract documentation

* update solidity-docgen

* add docsite as dependency and adjust script

* update openzeppelin-docsite

* update solidity-docgen

* remove dummy text

* update docgen and docsite

* update openzeppelin-docsite

* add netlify.toml

* udpate tokens guide for 2.2

* add DOCUMENTATION.md

* Update docs/learn-about-utilities.md

Co-Authored-By: frangio <frangio.1@gmail.com>

* fix PaymentSplitter docs wording

* update solidity-docgen

* add missing ERC20 contracts

* update solidity-docgen

* trigger deploy with cleared cache

* update solidity-docgen

* update openzeppelin-docsite

* remove travis docs setup

* update openzeppelin-docsite

* switch to published solidity-docgen

package.json

@@ -12,6 +12,8 @@
     "compile": "truffle compile",
     "console": "truffle console",
     "coverage": "scripts/coverage.sh",
+    "docsite": "scripts/docsite.sh",
+    "docgen": "scripts/docgen.sh",
     "lint": "npm run lint:js && npm run lint:sol",
     "lint:fix": "npm run lint:js:fix",
     "lint:js": "eslint .",
@@ -53,10 +55,11 @@
     "ethereumjs-util": "^6.0.0",
     "ganache-cli": "^6.4.1",
     "ganache-cli-coverage": "https://github.com/frangio/ganache-cli/releases/download/v6.4.1-coverage/ganache-cli-coverage-6.4.1.tgz",
+    "openzeppelin-docsite": "github:OpenZeppelin/openzeppelin-docsite",
     "openzeppelin-test-helpers": "^0.3.2",
     "solhint": "^1.5.0",
     "solidity-coverage": "github:rotcivegaf/solidity-coverage#5875f5b7bc74d447f3312c9c0e9fc7814b482477",
+    "solidity-docgen": "^0.2.0-alpha.0",
     "truffle": "^5.0.0"
-  },
-  "dependencies": {}
+  }
 }