uv, uv-{python,tool}: add page

[pranavmangal]

Tried to do tldr uv but it could't find anything, so I have added the core pages for uv.

• The page(s) are in the correct platform directories: common, linux, osx, windows, sunos, android, etc.
• The page(s) have at most 8 examples.
• The page description(s) have links to documentation or a homepage.
• The page(s) follow the content guidelines.
• The PR title conforms to the recommended templates.
• Version of the command being documented (if known):

[tldr-bot]

The build for this PR failed with the following error(s):

pages/common/uv-tool.md:6: TLDR005 Example descriptions should end in a colon with no trailing characters
pages/common/uv-tool.md:10: TLDR005 Example descriptions should end in a colon with no trailing characters
pages/common/uv-tool.md:14: TLDR005 Example descriptions should end in a colon with no trailing characters
pages/common/uv-tool.md:18: TLDR005 Example descriptions should end in a colon with no trailing characters
pages/common/uv-tool.md:22: TLDR005 Example descriptions should end in a colon with no trailing characters

Please fix the error(s) and push again.

[spageektti]

LGTM, thanks!