cut v0.40.0
doc: first changes for DSL 1.0

Do not revert this PR after the transition period.  It contains
a README banner which needs to be deleted later, but also a
persistent doc file and an unrelated whitespace nit.
updates to release process after v0.40.0
Merge pull request #6072 from rolandwalker/dsl_transition_doc

doc: first changes for DSL 1.0
transition: doc preflight/postflight stanzas

a mass change to Casks to come later
Update macdown container layout

Fixes #6075
Update bankid cask to use latest
Add Google Earth Web Plugin
Merge pull request #6002 from andreineculau/use-latest-bankid

Update bankid cask to use latest
Add JetBrains CLion 138.1965.18
Merge pull request #6074 from rolandwalker/preflight_postflight_transition

transition: doc preflight/postflight stanzas
Merge pull request #6073 from rolandwalker/releasing_updates_0.40.0

updates to release process after v0.40.0
added guitar tuner
Use 2.0 instead of latest for Semulov.app
Merge pull request #6084 from johndbritton/semulov-2-0

Use 2.0 instead of latest for Semulov.app
Merge pull request #6077 from rolandwalker/macdown_subdir

Update macdown container layout
rename delta file and update transition docs

requires #6074 (may show merge conflict)
Merge pull request #6078 from diimdeep/google-earth-web-plugin

Add Google Earth Web Plugin
Update Pandoc to 1.13.1
Merge pull request #6085 from ndr-qef/pandoc

Update Pandoc to 1.13.1