chore(web): allow reearth_config.json to be set remotely for local development

[keiya01]

Overview

You can specify the remote reearth config through an environment variable for development in local env.

REEARTH_WEB_CONFIG_URL="URL for ReEarth config"

What I've done

What I haven't done

How I tested

Which point I want you to review particularly

Memo

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[codecov]

Codecov Report

Merging #559 (64803c1) into main (c603f7b) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #559      +/-   ##
==========================================
- Coverage   27.32%   27.31%   -0.01%     
==========================================
  Files        1345     1345              
  Lines      144972   145014      +42     
  Branches     3541     3541              
==========================================
  Hits        39607    39607              
- Misses     104213   104255      +42     
  Partials     1152     1152              

Flag	Coverage Δ
web	24.78% <0.00%> (-0.01%)	⬇️
web-beta	24.78% <0.00%> (-0.01%)	⬇️
web-classic	24.78% <0.00%> (-0.01%)	⬇️
web-utils	24.78% <0.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
.../classic/components/molecules/Visualizer/index.tsx	0.00% <0.00%> (ø)

... and 2 files with indirect coverage changes