[documentation] document how to install `robotcode analyze`

[DetachHead]

Describe the bug according to the release notes for 0.96.0 and the docs, there's a new command called analyze, however it doesn't seem to exist in the latest release:

> robotcode --version
robotcode, version 0.96.0
> robotcode analyze
Usage: robotcode [OPTIONS] COMMAND [ARGS]...
Try 'robotcode --help' for help.

Error: No such command 'analyze'.

Steps To Reproduce

1. install robotcode from pypi
2. run robotcode analyze

Expected behavior the command exists

Additional context i raised an issue about the CLI a while ago (#206) back when it was only used internally, however since there is now documentation and release notes mentioning the CLI i'm assuming it's now supposed to be public?

Desktop (please complete the following information):

• VS Code Version N/A
• RobotCode Version 0.96.0
• OS: windows 11
• Python Version 3.13
• RobotFramework Version 7.1.1

[DetachHead]

oh, i see it's an extra: robotcode[analyze]. perhaps the documentation could be updated to mention this

[KotlinIsland]

if the extra isn't installed, the cli should say as much, not that the command doesn't exist