Remove some outdated badges from README.md (ampproject#38646)

Author: danielrozenberg

README.md

@@ -5,19 +5,6 @@
 [![Build Status](https://img.shields.io/circleci/build/github/ampproject/amphtml/main 'Build Status')](https://app.circleci.com/pipelines/github/ampproject/amphtml?branch=main)
 [![GitHub Release](https://img.shields.io/github/release/ampproject/amphtml.svg?logo=GitHub&style=flat-square 'GitHub Release')](https://github.com/ampproject/amphtml/releases/latest)
 [![Commits](https://img.shields.io/github/commit-activity/m/ampproject/amphtml.svg?logo=GitHub&style=flat-square 'Commits')](https://github.com/ampproject/amphtml/pulse/monthly)
-[![Badges](https://img.shields.io/badge/badges-16-brightgreen?logo=GitHub&style=flat-square)](#)
-
-<details>
-<summary>
-Metrics
-  
-</summary>
-
-[![Absolute Code Coverage](https://img.shields.io/endpoint.svg?logo=Codecov&logoColor=white&style=flat-square&url=https%3A%2F%2Famp-project-metrics.appspot.com%2Fapi%2Fbadge%2FAbsoluteCoverageMetric 'Test coverage for the repository as computed by CodeCov')](https://codecov.io/gh/ampproject/amphtml/)
-[![Cherrypick Issue Count](https://img.shields.io/endpoint.svg?logo=GitHub&logoColor=white&style=flat-square&url=https%3A%2F%2Famp-project-metrics.appspot.com%2Fapi%2Fbadge%2FCherrypickIssueCountMetric 'Number of cherry-pick issues in the last 90 days')](https://github.com/ampproject/amphtml/issues?utf8=%E2%9C%93&q=is%3Aissue+title%3A+%22Cherry-pick%22)
-[![Release Granularity](https://img.shields.io/endpoint.svg?logo=GitHub&logoColor=white&style=flat-square&url=https%3A%2F%2Famp-project-metrics.appspot.com%2Fapi%2Fbadge%2FReleaseGranularityMetric 'Average commits per release over the last 90 days')](https://github.com/ampproject/amphtml/releases)
-
-</details>
 
 <details>
 <summary>
@@ -28,7 +15,6 @@ Tooling
 [![Percy](https://img.shields.io/badge/%F0%9F%A6%94%20visual%20testing-Percy-violet.svg?style=flat-square 'Percy')](https://percy.io/ampproject/amphtml)
 [![Prettier](https://img.shields.io/badge/code_style-Prettier-ff69b4.svg?logo=Prettier&logoColor=white&style=flat-square 'Prettier')](https://github.com/prettier/prettier)
 [![Codecov](https://img.shields.io/badge/test_coverage-CodeCov-f01f7a.svg?logo=Codecov&logoColor=white&style=flat-square 'Codecov')](https://codecov.io/gh/ampproject/amphtml/)
-[![LGTM](https://img.shields.io/lgtm/alerts/github/ampproject/amphtml.svg?logo=lgtm&style=flat-square 'LGTM')](https://lgtm.com/projects/g/ampproject/amphtml/)
 [![Renovate](https://img.shields.io/badge/renovate-enabled-brightgreen.svg?logo=dependabot&style=flat-square 'Renovate')](https://renovateapp.com/)
 
 </details>