fix(typescript): handle github config set to false

[hendrikheil]

Fixes a typescript error introduced by #1188

Error: app/components/app/AppFooterRight.vue(11,21): error TS2339: Property 'url' does not exist on type 'false | { owner: string; name: string; url: string; branch: string; rootDir?: string | undefined; }'.
  Property 'url' does not exist on type 'false'.
Error: app/components/app/AppFooterRight.vue(13,28): error TS2339: Property 'url' does not exist on type 'false | { owner: string; name: string; url: string; branch: string; rootDir?: string | undefined; }'.
  Property 'url' does not exist on type 'false'.
Error: app/components/app/AppHeader.vue(9,48): error TS2339: Property 'url' does not exist on type 'false | { owner: string; name: string; url: string; branch: string; rootDir?: string | undefined; }'.
  Property 'url' does not exist on type 'false'.
Error: app/components/app/AppHeader.vue(13,32): error TS2339: Property 'url' does not exist on type 'false | { owner: string; name: string; url: string; branch: string; rootDir?: string | undefined; }'.
  Property 'url' does not exist on type 'false'.
Error: app/pages/[[lang]]/[...slug].vue(112,38): error TS2339: Property 'url' does not exist on type 'false | { owner: string; name: string; url: string; branch: string; rootDir?: string | undefined; }'.
  Property 'url' does not exist on type 'false'.

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commit: fbb4637