Squashed 'docs/' changes from 7297c1172..d3eb97a33

Squashed 'docs/' changes from 7297c1172..d3eb97a33

d3eb97a33 Document .IsSection page variable
a068bcf5c Ace and Amber support was removed with #6609
5cd9ca4b2 Mention MacPorts also on the Installing page  (#1215)
0ae8f5c19 Add instructions for using Macports
d50aba8f0 Revise ref and relref function pages
a17e25d6f Update quick-start.md: move notice about drafts up
cf87a5da2 Update macOS tarball installation instructions (#1203)
2e701f8f3 Corrected the url for index function link
736bd59e0 Clarify treatment of zero weights (#1207)
42a19f479 Fix example of output from urlize function
34f8de26d Revise content-management/cross-references
252435a95 Rewrite Translation of Strings
f0882bc14 Remove note that has been outdated by v0.71.0
dfe28ceb5 Improve mounts module config
58029627d Fix erroneous example code piping to if

git-subtree-dir: docs
git-subtree-split: d3eb97a3328f5390801bbce017233ce895fc2d28