Merge branch 'main' of https://git.fitko.de/fit-connect/docs into 404-add-back-to-root-link

.gitlab-ci.yml

docs/apis/routing-api.mdx

docs/changelog.md

docs/getting-started/account.mdx

docs/getting-started/authentication.mdx

docs/getting-started/first-steps.mdx

docs/receiving/certificate.mdx

docs/receiving/download-submission.mdx

docs/receiving/process-and-acknowledge.mdx

docs/responsibilities/get-destination.mdx

docs/sending/attachments.mdx

docs/sending/start-submission.mdx

docs/sending/submit.mdx

src/views/ApiSpec.js

static/images/roadmap/fitconnect_roadmap.png