Use the integrations.sh logo for GitHub and OpenAI presets (#1547)

The GitHub presets pointed at svgl's `github_dark.svg`, which is the
dark-BACKGROUND variant: its paths are filled `#ffff`. Rendered on the light
UI that is a white mark on a white surface, so the GitHub entry in the
integrations list and in the connect dialog looked blank. `openai_dark.svg`
has the same problem.

Point both at integrations.sh instead, which `integration-favicon.tsx` calls
executor's single logo source and which the neighbouring Figma, Stripe and
Vercel presets already use. Those logos carry their own background, so they
stay legible on either theme -- preset icons render as a plain `<img>` with
no theme-aware variant selection, so one URL has to work on both.

Co-authored-by: Rhys Sullivan <39114868+RhysSullivan@users.noreply.github.com>

Author: midego1

packages/plugins/graphql/src/sdk/presets.ts

@@ -15,7 +15,7 @@ export const graphqlPresets: readonly GraphqlPreset[] = [
     summary: "Repos, issues, PRs, and users via GitHub's GraphQL API.",
     url: "https://api.github.com/graphql",
     endpoint: "https://api.github.com/graphql",
-    icon: "https://svgl.app/library/github_dark.svg",
+    icon: "https://integrations.sh/logo/github.com",
     featured: true,
   },
   {

packages/plugins/openapi/src/sdk/presets.ts

@@ -81,7 +81,7 @@ const openApiOnlyPresets: readonly OpenApiPreset[] = [
     name: "GitHub REST",
     summary: "Repos, issues, pull requests, actions, and users.",
     url: "https://raw.githubusercontent.com/github/rest-api-description/main/descriptions/api.github.com/api.github.com.json",
-    icon: "https://svgl.app/library/github_dark.svg",
+    icon: "https://integrations.sh/logo/github.com",
     featured: true,
     authTemplate: [GITHUB_OAUTH_TEMPLATE],
   },
@@ -106,7 +106,7 @@ const openApiOnlyPresets: readonly OpenApiPreset[] = [
     name: "OpenAI",
     summary: "Models, files, responses, and fine-tuning.",
     url: "https://app.stainless.com/api/spec/documented/openai/openapi.documented.yml",
-    icon: "https://svgl.app/library/openai_dark.svg",
+    icon: "https://integrations.sh/logo/openai.com",
     featured: true,
   },
   {