docs(lidar_centerpoint): fix path of image

[Shin-kyoto]

Description

• Link in lidar_centerpoint is determined to be broken. So I want to change link path.
  
• I uploaded this image file to github, and I got the link below; https://github.com/autowarefoundation/autoware.universe/assets/58775300/2a89063a-8e0e-4f59-8d48-f339d4f7c0ff

Tests performed

Not applicable.

Effects on system behavior

Not applicable.

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[knzo25]

@Shin-kyoto
Is there a specific reason to avoid uploading images directly into the repository?
Other packages in universe seem to be doing so

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (3f63c15) 14.51% compared to head (788c9b8) 14.51%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3764   +/-   ##
=======================================
  Coverage   14.51%   14.51%           
=======================================
  Files        1439     1439           
  Lines      101307   101307           
  Branches    30061    30061           
=======================================
  Hits        14708    14708           
  Misses      70510    70510           
  Partials    16089    16089           

Flag	Coverage Δ		*Carryforward flag
differential	0.00% <ø> (?)
total	14.51% <ø> (ø)		Carriedforward from 3f63c15

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[Shin-kyoto]

@Shin-kyoto Is there a specific reason to avoid uploading images directly into the repository? Other packages in universe seem to be doing so

I avoid uploading it directly into the repo because it makes git clone slower.
I got an advice from @kminoda. Do you, @kminoda think about it?

[knzo25]

LGTM

[Shin-kyoto]

Thanks!

Additionally, I think we should move this doc to autoware documentation page because today's situation that README.md is included in launch directory is not good and the way to compare two model is suitable to be written down on documentation.