Regroup and rename APIs in Sample App

[alandn-circle]

We want to regroup API endpoints based on which API(s) they belong to (Payments, Payouts, Digital Dollar Accounts, Marketplace). We also want to add a new section entitled "Core Functionality" that contains endpoints present in all APIs.

The bulk of these changes lie in the navigation and the API viewers for such APIs.

[alandn-circle]

Once these changes are good to go, I'll also be removing the files debug/wallets/index.vue and debug/businessAccount/index.vue (these will be outdated) prior to merging to master.

[MasterXen]

Verified locally (including marketplaces) and compared to the ordering of the updated API docs

[kristinfritsch]

Some cleanup comments, but not a blocker:

• (Caution: When using a production api key it will charge your card) can be removed from /debug/payouts
• let's remove the page /debug/ (it is linked from the home page and we should remove the link there too)
• This sample web application demonstrates some of the features of the Circle Payments API let's change that to This sample web application demonstrates some of the features of the Circle APIs with link to https://www.circle.com/en/developers

[MasterXen]

Build failed due to:

/opt/circle/payments-sample-app/src/lib/businessAccount/depositsApi.ts
--
382 | 38:1  error  Delete `⏎`                          prettier/prettier
383 | 38:1  error  More than 1 blank line not allowed  no-multiple-empty-lines

Prettier is not playing games!

[MasterXen]

I "fixed" the extra line break violation