conda-{activate, clean, compare}: add page. conda-create: add prefix …

[oleksii-kulyk]

Hi, I have added 3 files and changed 1 in this PR.
I have added:

• conda activate

• conda clean

• conda compare
  I have changed conda create by adding more examples to it and restructuring it.

• [x ] The page(s) are in the correct platform directories: common, linux, osx, windows, sunos, android, etc.

• [x ] The page(s) have at most 8 examples.

• [x ] The page description(s) have links to documentation or a homepage.

• [x ] The page(s) follow the content guidelines.

• [x ] The page(s) follow the style guide.

• [x ] The PR title conforms to the recommended templates.

• conda version 25.7.0

[Managor]

I recommend doing changes one page at a time so you don't make the same mistake multiple times.
[c]ache can stay because it's not immediately apparent what it's short for.

[oleksii-kulyk]

Thank you @Managor for your feedback! I have integrated it.

[oleksii-kulyk]

Thank you @Managor once again!

[Managor]

As we get through the more obvious mistakes, that allows me to focus on other mistakes. We'll get to acceptable state eventually.

[oleksii-kulyk]

Changes accepted, thank you!

[oleksii-kulyk]

Thank you @dmmqz! Changes accepted.