mkdocs: add migration nav

docs/mkdocs/migration/binary.md

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+No need to fix.

docs/mkdocs/migration/debian_ubuntu.md

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+Use `https://aquasecurity.github.io` instead of `https://knqyf263.github.io`.
+
+```bash
+$ apt-get remove --purge trivy
+$ sed -i s/knqyf263/aquasecurity/g /etc/apt/sources.list.d/trivy.list
+$ apt-get update
+$ apt-get install trivy
+```

docs/mkdocs/migration/homebrew.md

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+Tap aquasecurity/trivy
+
+```bash
+$ brew uninstall --force trivy
+$ brew untap knqyf263/trivy
+$ brew install aquasecurity/trivy/trivy
+```

docs/mkdocs/migration/index.md

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+On 19 August 2019, Trivy's repositories moved from `knqyf263/trivy` to `aquasecurity/trivy`. If you previously installed Trivy you should update any scripts or package manager records as described in this section.
+
+If you have a script that installs Trivy (for example into your CI pipelines) you should update it to obtain it from the new location by replacing knqyf263/trivy with aquasecurity/trivy.
+
+For example:
+```bash
+# Before
+$ wget https://github.com/knqyf263/trivy/releases/download/v${VERSION}/trivy_${VERSION}_Linux-64bit.tar.gz
+
+# After
+$ wget https://github.com/aquasecurity/trivy/releases/download/v${VERSION}/trivy_${VERSION}_Linux-64bit.tar.gz
+```

docs/mkdocs/migration/rhel_centos.md

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+Use `https://aquasecurity.github.io` instead of `https://knqyf263.github.io`.
+
+```bash
+$ yum remove trivy
+$ sed -i s/knqyf263/aquasecurity/g /etc/yum.repos.d/trivy.repo
+$ yum update
+$ yum install trivy
+```