ci: add support for markdown lint (#206)

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## Overview

Closes #185

## Checklist

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- [ ] New and updated code has appropriate documentation
- [ ] New and updated code has new and/or updated testing
- [ ] Required CI checks are passing
- [ ] Visual proof for any user facing features like CLI or
documentation updates
- [ ] Linked issues closed with keywords

.github/workflows/lint.yml

@@ -30,3 +30,8 @@ jobs:
             git diff
             exit 1
           fi
+  markdown-lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: celestiaorg/.github/.github/actions/[email protected]

.markdownlint.yaml

@@ -0,0 +1,5 @@
+"default": true # Default state for all rules
+"MD010":
+  "code_blocks": false # Disable rule for hard tabs in code blocks
+"MD013": false # Disable rule for line length
+"MD033": false # Disable rule banning inline HTML

README.md

@@ -5,7 +5,7 @@
 [![GoDoc](https://img.shields.io/badge/godoc-reference-blue?style=flat-square&logo=go)](https://godoc.org/github.com/celestiaorg/quantum-gravity-bridge)
 [![Go Report Card](https://goreportcard.com/badge/github.com/celestiaorg/quantum-gravity-bridge?style=flat-square)](https://goreportcard.com/report/github.com/celestiaorg/quantum-gravity-bridge)
 [![Version](https://img.shields.io/github/tag/celestiaorg/quantum-gravity-bridge.svg?style=flat-square)](https://github.com/celestiaorg/quantum-gravity-bridge/releases/latest)
-[![License: Apache-2.0](https://img.shields.io/github/license/celestiaorg/quantum-gravity-bridge.svg?style=flat-square)](https://github.com/celestiaorg/quantum-gravity-bridge/blob/main/LICENSE)
+[![License: Apache-2.0](https://img.shields.io/github/license/celestiaorg/quantum-gravity-bridge.svg?style=flat-square)](https://github.com/celestiaorg/quantum-gravity-bridge/blob/master/LICENSE)
 
 The Quantum Gravity Bridge (QGB) is a Celestia -> EVM message relay.
 It is based on Umee's Gravity Bridge implementation, [Peggo](https://github.com/umee-network/peggo).