fleshed out missing help system data

src/bottles/help/activate

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+cellar activate <bottle>
+
+Marks a given WINE bottle as "active". <bottle> can be one of the following:
+ - An absolute path, or a relative path (prefixed with "./")
+ - A simple string, which is assumed to be a suffix for a cellar-managed WINE
+   bottle. For instance, "cellar activate example" would set the active WINE
+   bottle to "~/.wine.example".
+ - As above, with the ".wine." prefix. cellar will accept this, but will throw
+   warnings about it.

src/bottles/help/active

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+cellar active
+
+Prints the name of the active WINE bottle, as specified in cellar.json.

src/bottles/help/config

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+cellar config get <key>
+cellar config set <key> <value>
+
+The first command prints the contents of <key> from cellar.json in the active
+WINE bottle. The second command sets <key> in the same file to <value>.

src/bottles/help/list

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+cellar list
+
+Prints a list of all cellar managable WINE bottles in your home directory, and
+some basic information about them.