ENG-8885: Update hosting links

[carlosabadia]

No description provided.

[linear]

ENG-8885 Documentation Updates

[greptile-apps]

Greptile Summary

This PR updates hosting-related links across three documentation files to use a centralized REFLEX_CLOUD_URL constant (now defaulting to https://build.reflex.dev/) instead of previously hardcoded https://cloud.reflex.dev/ URLs, reflecting the migration to the new build domain.

• pcweb/constants.py: REFLEX_CLOUD_URL default changed from https://cloud.reflex.dev/ to https://build.reflex.dev/, which is now identical to REFLEX_BUILD_URL's default — raising a potential redundancy concern
• docs/hosting/regions.md: Flag image src URLs updated to use REFLEX_CLOUD_URL constant; correctness depends on the new domain serving these static SVG assets
• docs/hosting/config_file.md and docs/hosting/databricks.md: Hardcoded cloud dashboard URLs replaced with the constants.REFLEX_CLOUD_URL constant — clean, low-risk changes

Confidence Score: 3/5

• Mostly safe, but the flag image URL change in regions.md could silently break the UI if build.reflex.dev does not serve those static assets.
• The documentation link changes are straightforward and correct. The main risk is the flag SVG assets at the new domain — if they aren't served there, all country flags in the regions table will be broken with no obvious error. Additionally, REFLEX_CLOUD_URL and REFLEX_BUILD_URL now share the same default, which is technically redundant.
• docs/hosting/regions.md and pcweb/constants.py need closer attention.

Important Files Changed

Filename	Overview
pcweb/constants.py	Default value of REFLEX_CLOUD_URL updated from https://cloud.reflex.dev/ to https://build.reflex.dev/, making it identical to REFLEX_BUILD_URL's default, creating redundancy.
docs/hosting/regions.md	Flag image URLs updated to use REFLEX_CLOUD_URL constant instead of hardcoded cloud.reflex.dev; the new domain must serve the flag SVG assets for the regions table to function correctly.
docs/hosting/config_file.md	Hardcoded https://cloud.reflex.dev/ URL replaced with the constants.REFLEX_CLOUD_URL constant; clean, straightforward change.
docs/hosting/databricks.md	Hardcoded Reflex Cloud Tokens URL replaced with constants.REFLEX_CLOUD_URL constant; clean import and usage.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[pcweb/constants.py\nREFLEX_CLOUD_URL = build.reflex.dev] --> B[config_file.md]
    A --> C[databricks.md]
    A --> D[regions.md]

    B --> E[project uuid URL in prose]
    C --> F[tokens URL in markdown link]
    D --> G[flag image src URLs]

    G --> H{flags served at\nbuild.reflex.dev?}
    H -- Yes --> I[Flags render correctly]
    H -- No --> J[Broken flag images in table]

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_{Last reviewed commit: ad81640}