Ignore blank lines between front matter and entry body

.RawContent keeps the newline that follows the closing front matter
delimiter, and only trailing whitespace was being chomped. An entry
written with a blank line there, which is what the entry archetype
produces, got one more blank line under its pageinfo line in the
gemtext than an entry written without one.

The same leading newline also hid a heading on the first line from the
check that decides whether to add a separating newline, since that
pattern is anchored to the start of the content.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

0 files changed, 0 insertions, 0 deletions