doc: Separate pages into sub directories.

docs/api/common/clipboard.md

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+# clipboard
+
+An example of writing a string to clipboard:
+
+```javascript
+var clipboard = require('clipboard');
+clipboard.writeText('Example String');
+```
+
+## clipboard.readText()
+
+Returns the content in clipboard as plain text.
+
+## clipboard.writeText(text)
+
+* `text` String
+
+Writes the `text` into clipboard as plain text.
+
+## clipboard.clear()
+
+Clears everything in clipboard.
+
+## clipboard.has(type)
+
+* `type` String
+
+Returns whether clipboard has data in specified `type`.
+
+**Note:** This API is experimental and could be removed in future.
+
+## clipboard.read(type)
+
+* `type` String
+
+Reads the data in clipboard of the `type`.
+
+**Note:** This API is experimental and could be removed in future.

docs/api/common/shell.md

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+# shell
+
+The `shell` module provides functions related to desktop integration.
+
+An example of opening a URL in default browser:
+
+```javascript
+var shell = require('shell');
+shell.openExternal('https://github.com');
+```
+
+## shell.showItemInFolder(fullPath)
+
+* `fullPath` String
+
+Show the given file in a file manager. If possible, select the file.
+
+## shell.openItem(fullPath)
+
+* `fullPath` String
+
+Open the given file in the desktop's default manner.
+
+## shell.openExternal(url)
+
+* `url` String
+
+Open the given external protocol URL in the desktop's default manner. (For
+example, mailto: URLs in the default mail user agent.)
+
+## shell.moveItemToTrash(fullPath)
+
+* `fullPath` String
+
+Move the given file to trash.
+
+## shell.beep()
+
+Play the beep sound.