feat: remove network configuration from base-parachain

[moliholy]

As discussed in r0gue-io/base-parachain#69 (review), this PR removes the network.toml file from the base-parachain template.

[codecov]

Codecov Report

❌ Patch coverage is 80.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 76.96%. Comparing base (cfe2df3) to head (5bbe283).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/pop-chains/src/new_chain.rs	80.00%	2 Missing and 1 partial ⚠️

@@            Coverage Diff             @@
##             main     #711      +/-   ##
==========================================
+ Coverage   76.92%   76.96%   +0.04%     
==========================================
  Files         111      111              
  Lines       25240    25251      +11     
  Branches    25240    25251      +11     
==========================================
+ Hits        19415    19434      +19     
+ Misses       3767     3761       -6     
+ Partials     2058     2056       -2     

Files with missing lines	Coverage Δ
crates/pop-chains/src/new_chain.rs	80.70% <80.00%> (+2.06%)	⬆️

... and 1 file with indirect coverage changes

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[AlexD10S]

LGTM! Thanks for the 'workaround' checking the version