Gitter broke their older API as part of being integrated
into Matrix.
Their announcement blog says:
"Anything left using the Gitter APIs will need to be
updated to use the Matrix API"
This commit drops the legacy Gitter import tool and
we plan to build a new one for Matrix in future.
(cherry picked from commit b17a006bf0)
The Markdown files in this directory ( /zulip/docs ) are not intended
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read the Zulip documentation.