Fixed links for Install and build in README

[romi2002]

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Basic Info

Info
Ticket(s) this addresses	N/A
Primary OS tested on	Github
Robotic platform tested on	N/A

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Description of contribution in a few bullet points

• Currently the README.md is linking to an invalid page in the docs (404 error) for build and install instructions.

• Changed links from https://navigation.ros.org/build_instructions/index.html to the Build and Install page in https://navigation.ros.org/development_guides/build_docs/index.html.

Description of documentation updates required from your changes

N/A

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For Maintainers:

• Check that any new parameters added are updated in navigation.ros.org
• Check that any significant change is added to the migration guide
• Check that any new features OR changes to existing behaviors are reflected in the tuning guide
• Check that any new functions have Doxygen added
• Check that any new features have test coverage
• Check that any new plugins is added to the plugins page
• If BT Node, Additionally: add to BT's XML index of nodes for groot, BT package's readme table, and BT library lists

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (e066ed1) 90.30% compared to head (c8c2210) 90.32%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3963      +/-   ##
==========================================
+ Coverage   90.30%   90.32%   +0.01%     
==========================================
  Files         415      415              
  Lines       18462    18462              
==========================================
+ Hits        16673    16676       +3     
+ Misses       1789     1786       -3     

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[SteveMacenski]

Thanks!