[docs] added ability to add static pages in docs folder and README.md in modules and doctypes

accounts/README.md

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+Accounts module contains masters and transactions to manage a traditional
+double entry accounting system.
+
+Accounting heads are called "Accounts" and they can be groups in a tree like
+"Chart of Accounts"
+
+Entries are:
+
+- Journal Vouchers
+- Sales Invoice (Itemised)
+- Purchase Invoice (Itemised)
+
+All accounting entries are stored in the `General Ledger`