Remove unnecessary heading from 'Helpdesk' page
Update subtitle of 'Hosting' page
Rewrite of 'Accessibility testing' for style

bullet lists, removal of banned words, plain English etc.
Rewrite of 'Analytics tools' for style

bullet lists, plain E, removal of banned words...
Rewrite of 'Configuration management' for style

bullet lists, removal of banned words, plain E, voice...
Rewrite of 'Cookies' for style

bullet lists, voice, removing banned words etc
Rewrite of 'Information security' for style

bullet lists, removing banned words, plain E, layout etc
Rewrite of 'Progressive enhancement' for style

bullet lists, removing banned words, etc
Rewrite of 'Release strategies' for style

bullet lists, plain E, removing banned words, voice etc
Rewrite of 'Sandbox and staging servers' for style

bullet lists, plain E, removing banned words etc
rewrite of 'Version control' for style

change link, use bullet lists etc
rewrite of 'Choosing technology' for style
rewrite of 'Code testing' for style
Amend areas -> aspects in 'Version control'
rewrite of 'Logins' for style

bullet lists, removing banned words etc..
rewrite of 'Open standards' for style

bullet lists, removing banned words etc
rewrite of 'Standalone apps' for style

using bullet lists removing banned words etc
Change some references from GDS to government

As @garethr points out on #350, this manual is about more than GDS.

I've left one reference to GDS that he flagged, because it gives
specific examples of reasons that GDS do something.
Improve a couple of 'Making software' pages

Based on comments on #350.

- 'change over time' because 'develop' is too software-y
- 'GOV.UK servers' isn't a relevant title
- make a distinction between GOV.UK and GDS
Change 'javascript' to 'JavaScript'

The name of the language is JavaScript.