Update project description (#2107)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

CHANGELOG.md

@@ -1516,6 +1516,7 @@ raw template
 {%- endblock in_prompt -%}
     """
 
+
 exporter_attr = AttrExporter()
 output_attr, _ = exporter_attr.from_notebook_node(nb)
 assert "raw template" in output_attr

pyproject.toml

@@ -6,7 +6,13 @@ build-backend = "hatchling.build"
 name = "nbconvert"
 authors = [{name = "Jupyter Development Team", email = "jupyter@googlegroups.com"}]
 license = {file = "LICENSE"}
-description = "Converting Jupyter Notebooks"
+description = """Converting Jupyter Notebooks (.ipynb files) to other formats.
+
+Output formats include asciidoc, html, latex, markdown, pdf, py, rst, script.
+
+nbconvert can be used both as a Python library (`import nbconvert`)
+or as a command line tool (invoked as `jupyter nbconvert ...`).
+"""
 readme = "README.md"
 keywords = ["Interactive", "Interpreter", "Shell", "Web"]
 classifiers = [