pages.ar/*: update links to the ones from the English version

[trolzen]

• The page(s) are in the correct platform directories: common, linux, osx, windows, sunos, android, etc.
• The page description(s) have links to documentation or a homepage.
• The page(s) follow the content guidelines.
• The page(s) follow the style guide.
• The PR contains at most 5 new pages.
• The PR title conforms to the recommended templates.

[CLAassistant]

All committers have signed the CLA.

[trolzen]

• The page pages.ar/common/newsboat.md is outdated, based on the command contents itself, compared to the English page.
• The page pages.ar/common/pip.md is outdated, based on number of commands, compared to the English page.

I've updated the commands for newsboat.

I'm not fluent in Arabic, so I cannot update the translation for pip.

[tldr-bot]

Hello! I've noticed something unusual when checking this PR at commit
9b06edcaa17e2a768a4254ba5dd4bdbd7874f415:

• The page pages.ar/common/pip.md is outdated, based on number of commands, compared to the English page.

Is this intended? If so, just ignore this comment. Otherwise, please double-check the commits.

[MachiavelliII]

• The page pages.ar/common/newsboat.md is outdated, based on the command contents itself, compared to the English page.
• The page pages.ar/common/pip.md is outdated, based on number of commands, compared to the English page.

I've updated the commands for newsboat.

I'm not fluent in Arabic, so I cannot update the translation for pip.

Never mind, I'm going to handle this.