[Chicken-janitors] #342: Post-migration README fixes

[Chicken Trac]

#342: Post-migration README fixes
---------------------------+------------------------------------------------
 Reporter:  mario          |       Owner:  felix
     Type:  defect         |      Status:  new  
 Priority:  major          |   Milestone:  4.6.0
Component:  documentation  |     Version:  4.5.x
 Keywords:  README         |  
---------------------------+------------------------------------------------
 Mostly URI updates, some small fixes.  Patch attached.

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Ticket URL: <http://bugs.call-cc.org/ticket/342>
Chicken Scheme <http://www.call-with-current-continuation.org/>
Chicken Scheme is a compiler for the Scheme programming language.