docs: Remove pre-0.13.0 fee info

[stoobie]

Description of the Changes

Remove pre-0.13.0 fee info

PR Preview URL

https://starknet-io.github.io/starknet-docs/pr-1074/documentation/architecture_and_concepts/Network_Architecture/fee-mechanism/

Check List

• Changes have been done against main branch, and PR does not conflict
• PR title follows the convention: <docs/feat/fix/chore>(optional scope): <description>, e.g: fix: minor typos in code

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This change is 

[github-actions]

Your preview build is ready! ✨ Check the following link in 1-2 minutes: https://starknet-io.github.io/starknet-docs/pr-1074/documentation/ .

[github-actions]

Your preview build is ready! ✨ Check the following link in 1-2 minutes: https://starknet-io.github.io/starknet-docs/pr-1074/documentation/ .

[github-actions]

Your preview build is ready! ✨ Check the following link in 1-2 minutes: https://starknet-io.github.io/starknet-docs/pr-1074/documentation/ .

[github-actions]

Your preview build is ready! ✨ Check the following link in 1-2 minutes: https://starknet-io.github.io/starknet-docs/pr-1074/documentation/ .

[xiaolou86]

LGTM

[iliav-starkware]

Reviewed 1 of 1 files at r1, 1 of 2 files at r2, 1 of 1 files at r3, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @AnatVe)