Add v3.0 changelog

#230 - Limit districts by selected province

Added changelog for v2.9

re #932 - Language switch forced breadcrumbs to new line

Added v2.7 changelog

Added changelog for v2.6

Addd more Open Source software links

re #703 - Don't show disabled quicklinks

Merge branch 'refs/heads/feature/663-improvements'

re #619 - Exception page was not synced with susy