pip-lock, pip-search: add page (#18388)

Co-authored-by: Dylan <145150333+dmmqz@users.noreply.github.com>
Co-authored-by: Lena Pastwa <126529524+acuteenvy@users.noreply.github.com>

pages/common/pip-lock.md

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+# pip lock
+
+> Lock Python packages and their dependencies into a reproducible file.
+> Experimental feature of `pip`.
+> More information: <https://pip.pypa.io/en/stable/cli/pip_lock/>.
+
+- Generate a `pylock.toml` for the current project:
+
+`pip lock {{[-e|--editable]}} .`
+
+- Lock dependencies from a requirements file:
+
+`pip lock {{[-r|--requirement]}} {{path/to/requirements.txt}}`
+
+- Specify a custom output file for the lock:
+
+`pip lock {{[-o|--output]}} {{path/to/lockfile.toml}}`
+
+- Lock a specific package and its dependencies:
+
+`pip lock {{package}}`

pages/common/pip-search.md

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+# pip search
+
+> Search for Python packages by name or summary.
+> Doesn't work with PyPI; may work with other package indexes.
+> More information: <https://pip.pypa.io/en/stable/cli/pip_search/>.
+
+- Search for packages using a custom package index:
+
+`pip search {{[-i|--index]}} {{example.com}} {{query}}`