Performance analyst jd updated

Updated JD and index page
Content style updates
Updates

Content updates as suggested
Content update

Requested change to last paragraph in light of new Treasury guidance
launched this morning.
Reflected suggested changes
Fix broken URLs

This commit:

- moves GDS URLs over their redirects to the appropriate place
- fixes the link on the ideal alpha guidance
- changes some external hostnames to HTTPS
Merge pull request #337 from alphagov/fix-urls

Fix broken URLs
Updated entire DbD assessments pages

* add 2 new pages
* deleted 2 out-of-date pages
* inserted team updates in 4  pages, including index page
Remove trailing whitespace
Merge pull request #332 from alphagov/performance-analyst

Performance analyst jd updated
Merge pull request #331 from alphagov/dbd-assessments-updates

DbyD pages updates
Rewrite of Devops

Updated for style - removing banned words, inserting bullet lists etc.
Helpdesk rewrite for style

Update/rewrite for style: bullets, caps, banned words, tone of voice etc.
Rewrite of guidance for style

removed banned words, changed layout (inserting bullet lists), active tone etc.
minor style change
Rewrite of content for style

removing banned words, using bullet lists, being more direct with tone etc.
Rewrite of guidance for style

Removing banned words, using bullet points, active voice etc.
Rewrite of guidance for style

removing banned words, using bullet lists, other style points
Rewrite of guidance for style
hyphen for error-prone