lib/tasks/index.rake: skip building 'technical/scalar.txt'
lib/tasks/index.rake: skip building 'technical/scalar.txt'

The documentation built from Git includes both 'Documentation/scalar.txt'
and 'Documentation/technical/scalar.txt'. Because 'index_doc()' builds the
documentation by basename, these two files conflict, ultimately resulting in
only the latter being saved to the DB.

Long-term, the cleanest permanent solution to this problem is to rename
'technical/scalar.txt' to something else in Git. In the meantime, to ensure
that the (more important) command documentation is rendered at the
git-scm.com/docs/scalar URL, skip the 'technical/scalar.txt' build entirely.

This commit should be reverted when 'technical/scalar.txt' has been renamed
in Git.

Signed-off-by: Victoria Dye <3afbc00a3d30f5c4d0a95358d12e4c9f654fdf1c@github.com>

git/git-scm.com,git/git-scm.com,git/git-scm.com,git/git-scm.com