feat: add reading time (#6)

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- [x] I have pinned the dependencies to a specific patch version.

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### Tests

- [ ] My contribution adds new code, and I have added tests to cover it.
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Reviewed-on: #6
Co-authored-by: Naomi Carrigan <commits@nhcarrigan.com>
Co-committed-by: Naomi Carrigan <commits@nhcarrigan.com>

pnpm-lock.yaml

@@ -23,6 +23,9 @@ importers:
       react-markdown:
         specifier: 9.0.3
         version: 9.0.3(@types/react@19.0.7)(react@19.0.0)
+      reading-time:
+        specifier: 1.5.0
+        version: 1.5.0
       rehype-raw:
         specifier: 7.0.0
         version: 7.0.0
@@ -2352,6 +2355,9 @@ packages:
     resolution: {integrity: sha512-hOS089on8RduqdbhvQ5Z37A0ESjsqz6qnRcffsMU3495FuTdqSm+7bhJ29JvIOsBDEEnan5DPu9t3To9VRlMzA==}
     engines: {node: '>=8.10.0'}
 
+  reading-time@1.5.0:
+    resolution: {integrity: sha512-onYyVhBNr4CmAxFsKS7bz+uTLRakypIe4R+5A824vBSkQy/hB3fZepoVEf8OVAxzLvK+H/jm9TzpI3ETSm64Kg==}
+
   reflect.getprototypeof@1.0.10:
     resolution: {integrity: sha512-00o4I+DVrefhv+nX0ulyi3biSHCPDe+yLv5o/p6d/UVlirijB8E16FtfwSAi4g3tcqrQ4lRAqQSoFEZJehYEcw==}
     engines: {node: '>= 0.4'}
@@ -5642,6 +5648,8 @@ snapshots:
     dependencies:
       picomatch: 2.3.1
 
+  reading-time@1.5.0: {}
+
   reflect.getprototypeof@1.0.10:
     dependencies:
       call-bind: 1.0.8