A guide on ITSM and how it relates to all these agile goings on
Remove the nasty hybrid
Suggested by @samjsharpe, described what standard change means
A plethora of grammar fixes. Thanks to @annashipman
Added a lead in to the agile section

as per comments from @samjsharpe I've added an explicit bit about agile
and ITSM not being at odds. This was sort of inferred previously.
Fix links

- localhost reference
- prefer service manual links without .html in them
- some broken references
address non-sensical sentence
remove hyperbole
adjust language around starting with a framework
add useful link about ITIL and rapid releases
Merge pull request #368 from alphagov/service-management

A guide on ITSM and how it relates to all these agile goings on