fix: save Mainnet config with inline comments

[themantre]

Description

This PR saves the Mainet configs with the in-line comments upon creating the node.

[codecov]

Codecov Report

Merging #1143 (afc2808) into main (f9d89d9) will decrease coverage by 0.06%.
Report is 7 commits behind head on main.
The diff coverage is 0.00%.

❗ Current head afc2808 differs from pull request most recent head 4ebace1. Consider uploading reports for the commit 4ebace1 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1143      +/-   ##
==========================================
- Coverage   81.34%   81.28%   -0.06%     
==========================================
  Files         173      173              
  Lines        9234     9234              
==========================================
- Hits         7511     7506       -5     
- Misses       1369     1372       +3     
- Partials      354      356       +2