feat: Add Brand Fetch logo link for logos (see #43) (#99)

* feat: Add Brand Fetch logo link for logos

* docs: brand fetch integration docs

* Document CLIENT_ID location?

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>
Signed-off-by: Juan José Mata <jjmata@jjmata.com>

---------

Signed-off-by: Juan José Mata <jjmata@jjmata.com>
Co-authored-by: Vincent Teo <vinteo@gmail.com>
Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

docs/hosting/logos.md

@@ -0,0 +1,20 @@
+# Account, Merchant and Security Logos
+
+Sure has integration with the [Brand Fetch Logo Link](https://brandfetch.com/developers/logo-api) service to provide logos for accounts, merchants and securities.
+Logos are currently matched in the following ways:
+
+- For accounts, Plaid integration for the account is required and matched via FQDN (fully qualified domain name) from the Plaid integration
+- For merchants, OpenAI integration is required and automatically matched to the merchant name and matched via FQDN
+- For securities, logos are matched using the ticker symbol
+
+> [!NOTE]
+> Currently ticker symbol matching cannot specify the exchange and since US exchanges are prioritized, securities from other exchanges might not have the right logo.
+
+## Enabling Brand Fetch Integration
+
+A Brand Fetch Client ID is required and to obtain a client ID, sign up for an account [here](https://brandfetch.com/developers/logo-api).
+
+Once you enter the Client ID into the Sure settings under the `Self hosting` section, logos from Brand Fetch integration will be enabled.
+Alternatively, you can provide the client id using the `BRAND_FETCH_CLIENT_ID` environment variable to the web and worker services.
+
+![CLIENT_ID screenshot](logos-clientid.png)