Update gogs_migrate.sh

[cez81]

• Gitea version (or commit ref): master
• Git version:
• Operating system:
• Database (use [x]):
  • PostgreSQL
  • MySQL
  • MSSQL
  • SQLite
• Can you reproduce the bug at https://try.gitea.io:
  • Yes (provide example URL)
  • No
  • Not relevant
• Log gist:

Description

contrib/migrate/gogs_migrate.sh is hard-coded for v1.0.1. Is this script still relevant and useful? If so it needs updating. Could also be mentioned in the docs https://docs.gitea.io/en-us/upgrade-from-gogs/

Ref:
#1522
#532

[cez81]

Script dropped in #2947.