Remove Google ads
Use 4 space indent
fix Makefile

- phobos target release -> all

- remove ${DPL_DOCS} dependecy because
  it's lacking a build rule, use .PHONY
  dpl-docs instead
Add note about future deprecation of scope classes
Add paragraph to get a newline
use local dmd and phobos to compile dpl-docs
Merge pull request #626 from CyberShadow/remove-ads

Remove Google ads
Merge pull request #645 from JinShil/patch-1

Add note about future deprecation of scope classes
Merge pull request #641 from 9rnsr/fix_codeindent

Use 4 space indent for code sections
Merge pull request #644 from MartinNowak/fixBuild

fix Makefile
Fix issue 6251: docs should warn about foreach_reverse over delegate.
Merge pull request #647 from quickfur/bug6251

Fix issue 6251: docs should warn about foreach_reverse over delegate.
Now foreach_reverse with delegates has been deprecated.
Merge pull request #648 from quickfur/foreach_reverse_delegate

Now foreach_reverse with delegates has been deprecated.
Update variadic templates section

Use clearer names for variadic auto ref arguments.
Move tuple length and slicing details before example using length.
Update curry example -> partial and simplify by returning a closure.
Merge pull request #639 from ntrel/patch-2

Improve variadic templates section
Announce beta availability

v2.067.0-b1
v2.066.1-rc1