Changes to DbyD page

Removed a bullet point and updated 2 sentences.
DbyD changes

Bold changed to inverted commas.
A guide bringing together the position on open source

I've tested this with a few departments based on the type of questions
I've tended to be asked by policy people and occasioannly by technology
people unfamiliar with open source.
New content on assessing cloud security

Based on new guidance from CESG, reviewed by various people in GDS.
The guidance is in alpha but it's already proving useful in a number
of conversations. Notes here as a pointer to the guidance should be
reasonably unchanging as the guidance evolves.
be specific about ownership of cloud controls matrix
Merge pull request #359 from alphagov/digital-by-default-

Changes to DbyD page
correct GPG title layout
Cleaning up the Resources for developers section

Different people use the tags differently, with some pages having
_everyone_ as the primary audience and others being more selective.
This to me has led to a resources page that doesn't really work for
anyone.

I've tried to take a view on what a developer might be
interested in on the main resources page, moving more specialist content
to the secondary list.

This is probably quite opinionated so suggestions welcome. I'm not
saying something isn't important, I'm saying some things are relevant to
everyone (version control, progressive enhancement, testing) and some
things (CAPCHAs, load testing, Sass) are relevant either to specialists
or occasionally or both.
Open data in both sets of lists for CTOs
Merge pull request #364 from alphagov/duplicate-on-cto-resources

Open data in both sets of lists for CTOs
Merge pull request #363 from alphagov/update-dev-resources

Cleaning up the Resources for developers section
Consistent markdown usage
add a technical architect role index
Retag lots of the content for technical architects
Merge pull request #360 from alphagov/open-source

A guide bringing together the position on open source
Fix markdown
Merge pull request #361 from alphagov/cloud-security

New content on assessing cloud security
Return a more useful exit code from linting

We should not ‘compile’ the service manual if there are broken links.
Add usage for lint application
Exclude lint.go from jekyll copy