update docs

docs/Selfhosting.md

···
 5. (maybe necessary? will improve performance at least) create your own kv store by running `npx wrangler kv namespace create USER_DATA_CACHE` and when asked add it to the `wrangler.jsonc`
 
 DONE :) your blento should be live after a minute or two at `your-cloudflare-worker-or-custom-domain.com` and you can edit it by signing in with your bluesky account at `your-cloudflare-worker-or-custom-domain.com/edit`
+
+6. some cards need their own additional env keys, if you have these cards in your profile, create your keys and add them to your cloudflare worker
+
+- github profile: GITHUB_TOKEN
+- map: PUBLIC_MAPBOX_TOKEN