doc/hgrc: Some useful Mercurial settings

Some useful settings that might benefit new contributors and get them up
to speed with Modern Mercurial™ faster :)

doc/hgrc.ini

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+[paths]
+default = https://hg.prosody.im/trunk/
+default:pushrev = .
+default:pushurl = ssh://hg@hg.prosody.im/prosody-hg/
+
+contrib = https://hg.prosody.im/contrib/
+contrib:bookmarks.mode = ignore
+contrib:pushrev = .
+contrib:pushurl = ssh://hg@hg.prosody.im/contrib/
+
+[ui]
+
+# The Mercurial project recommends enabling tweakdefaults to get slight
+# improvements to the UI over time. Make sure to set HGPLAIN in the environment
+# when writing scripts!
+tweakdefaults = True
+
+[phases]
+# Disable marking changesets as published when pushing to a local repository
+publish = False
+
+[revsetalias]
+# Convenient alias to find current trunk revision
+trunk = last(public() and branch("default"))
+[experimental]
+# Require changes to have a topic branch
+topic-mode = enforce
+
+[fix]
+trailing-whitespace:command = sed
+trailing-whitespace:linerange = -e '{first},{last}s/\s\+$//'
+trailing-whitespace:pattern = set:not binary()
+
+astyle:command = astyle --indent=tab --attach-classes --indent-switches --break-blocks --pad-oper --unpad-paren --add-braces --align-pointer=name --lineend=linux
+astyle:pattern = set:**.c
+json:command = json_pp -json_opt canonical,pretty
+json:pattern = set:**.json
+
+[extensions]
+# The Mercurial Changeset Evolution plugin is strongly recommended
+evolve =
+# support for topic branches
+topic =