feat(v3): Restructure API docs for v3

[jstirnaman]

(I expect to do future work to streamline the docs generation and simplify the config.)

This PR closes #5397 with the following changes:

• Adds an API reference doc for the HTTP management API openapi spec (https://github.com/influxdata/granite/blob/main/openapi.yaml) (Cloud Dedicated only), hidden from sitemap and menus.

• Adds Management API examples from https://raw.githubusercontent.com/influxdata/granite/aea169033af0d7f7d6124c1a3cab61c085038bd2/scripts/test_http_api_v0_endpoints.sh

• Doesn't fetch changes for any specs except for the Management spec.

• Adds summaries and fixes descriptions in spec overrides.

• Removes versions in spec overrides.

• Adds configuration for generating API reference docs, Hugo frontmatter, setting the default API (for the [product]/api/ URL)

• Improves Hugo frontmatter descriptions and reuses titles and summaries from specs.

• Restructures /api-docs to better allow for multiple APIs (and customizations) per product

• Adds [product]/api/v2/ docs URL for cloud products (currently set as the "default" API, [product]/api)

• Refactors generate-api-docs to remove specific conditions and use the new directory structure.

• Redocly update fixes some theme formatting issues

• Tested with the following URLs:

  • http://localhost:1313/influxdb/v2/api/
  • http://localhost:1313/influxdb/v2/api/v1-compatibility/
  • http://localhost:1313/influxdb/cloud/api/
  • http://localhost:1313/influxdb/cloud/api/v2/
  • http://localhost:1313/influxdb/cloud-dedicated/api/
  • http://localhost:1313/influxdb/cloud-dedicated/api/management/
  • http://localhost:1313/influxdb/cloud-dedicated/api/v2/
  • http://localhost:1313/influxdb/cloud/api/v1-compatibility/
  • http://localhost:1313/influxdb/cloud-dedicated/api/v1-compatibility/
  • http://localhost:1313/influxdb/cloud-serverless/
  • http://localhost:1313/influxdb/cloud-serverless/api/v2/
  • http://localhost:1313/influxdb/cloud-serverless/api/v1-compatibility/
  • http://localhost:1313/influxdb/clustered/api/
  • http://localhost:1313/influxdb/clustered/api/v2/
  • http://localhost:1313/influxdb/clustered/api/v1-compatibility/

[jstirnaman]

Ah, wait, that's not supposed to show in the menu :/

[jstirnaman]

Ah, wait, that's not supposed to show in the menu :/

Fixed.