Repository languages and forks

What's Changed

• update to latest changes in clear by @mamantoha in #91
• use kemal-kilt shard by @mamantoha in #93
• rename db.cr to cli.cr by @mamantoha in #94
• Repository languages backend by @mamantoha in #95
• add color to languages by @mamantoha in #96
• Show repository languages in statistics by @mamantoha in #97
• encode/decode search and languages by @mamantoha in #98
• remove join from Repository with_dependents_count scope by @mamantoha in #99
• Retry GitLab responses with 500 code by @mamantoha in #100
• add fork to repositories by @mamantoha in #101
• create repository_forks by @mamantoha in #102
• v6.0.0 by @mamantoha in #103

Full Changelog: v5.0.0...v6.0.0