chore(cleanup): remove references to topup

[ctrlc03]

Description

Remove topup references

Confirmation

• I have read and understand MACI's contributor guidelines and code of conduct.
• I have read and understand MACI's GitHub processes.
• I have read and understand MACI's testing guide.

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Name	Status	Preview	Updated (UTC)
maci-website	✅ Ready (Inspect)	Visit Preview	May 22, 2024 3:04pm

[kittybest]

Is this PR also take care of the documentation part?

maci/website/versioned_docs/version-v2.0_alpha/quick-start/deployment.md

Line 25 in 5479617

7. Deploy Topup credit

maci/website/versioned_docs/version-v2.0_alpha/developers-references/integrating.md

Line 197 in 5479617

The MACI contract is the core of the protocol. Contracts can inherit from MACI and thus expose the signup and topup functions. As with standalone MACI, one would need to deploy a [sign up gatekeeper](/docs/developers-references/smart-contracts/Gatekeepers) as well as the [voice credit proxy](/docs/developers-references/smart-contracts/VoiceCreditProxy).

maci/website/versioned_docs/version-v2.0_alpha/developers-references/zk-snark-circuits/circuits.md

Line 403 in 5479617

#### ProcessTopup

⬆️ There is still topup mentioned here.

Also the pictures used to explain the message processing should be modified.

[ctrlc03]

Is this PR also take care of the documentation part?

maci/website/versioned_docs/version-v2.0_alpha/quick-start/deployment.md

Line 25 in 5479617

7. Deploy Topup credit

maci/website/versioned_docs/version-v2.0_alpha/developers-references/integrating.md

Line 197 in 5479617

The MACI contract is the core of the protocol. Contracts can inherit from MACI and thus expose the signup and topup functions. As with standalone MACI, one would need to deploy a [sign up gatekeeper](/docs/developers-references/smart-contracts/Gatekeepers) as well as the [voice credit proxy](/docs/developers-references/smart-contracts/VoiceCreditProxy).

maci/website/versioned_docs/version-v2.0_alpha/developers-references/zk-snark-circuits/circuits.md

Line 403 in 5479617

#### ProcessTopup

⬆️ There is still topup mentioned here.
Also the pictures used to explain the message processing should be modified.

first one is fixed in the deployment docs PR, second one too and the third I'm planning to have a separate PR for circuits to organize those docs and update all in one

[0xmad]

@ctrlc03 thanks, if docs are updated in next PR, it works!