docs: add no-sudo jtop install guide and helper script

[whitesscott]

• Added install_jtop_torun_without_sudo.sh for user-level jtop installation
• Updated README.md with Option 4 instructions and link to new guide
• Added docs/nosudo.rst explaining how the script works and why to use it

Summary by Sourcery

Enable user-level installation and execution of jtop without requiring sudo by providing a dedicated helper script, updating the README with a new install option, and adding comprehensive documentation

New Features:

• Add a helper script to install and run jtop without sudo using pipx
• Introduce Option 4 in the README to guide users to the no-sudo installation flow

Documentation:

• Add a detailed docs/nosudo.rst guide explaining the no-sudo installation process and rationale

[sourcery-ai]

Reviewer's Guide

This PR introduces a user-level, no-sudo installation flow for jtop by adding a helper script, updating the README with Option 4 instructions, and including detailed docs on how and why the script works.

File-Level Changes

Change	Details	Files
Introduce a non-root jtop install helper script	Guard against running as root; prompt for sudo credential ahead of time Check for pip3 and pipx, installing missing packages via apt Use pipx to install jetson_stats from GitHub Create and configure a systemd unit if absent Enable and start the jtop service without requiring sudo at runtime	install_jtop_torun_without_sudo.sh
Update README with Option 4 no-sudo install instructions	Add ‘Ubuntu 24.04 run jtop without sudo’ section Describe sudo -v preflight, script download, chmod, and execution steps Link to the full nosudo guide in docs/nosudo.rst	README.md
Add nosudo.rst documentation	Explain how the helper script works Describe benefits of user-level installation without sudo	docs/nosudo.rst

Possibly linked issues

• #N/A: The PR adds a script and documentation to enable non-root users to run jtop without sudo, directly resolving the permission issue.

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[sourcery-ai]

Hey there - I've reviewed your changes and they look great!

Prompt for AI Agents

Please address the comments from this code review:

## Individual Comments

### Comment 1
<location> `README.md:73` </location>
<code_context>
+First run "sudo -v"
+    -v, --validate does not run any command, but does allow the use of sudo in the bash script.
+Then "download install_jtop_torun_without_sudo.sh"
+Make it executible:
+chmod +x install_jtop_torun_without_sudo.sh
+Then run it:
</code_context>

<issue_to_address>
**issue (typo):** Typo: 'executible' should be 'executable'.

Please update the spelling to 'executable'.

```suggestion
Make it executable:
```
</issue_to_address>

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