Ignore lint for anchor for Linux install instructions

Author: wolf99

README.md

@@ -86,6 +86,10 @@ sudo /usr/local/share/gcm-core/uninstall.sh
 
 ---
 
+<!-- this explicit anchor should stay stable so that external docs can link here -->
+<!-- markdownlint-disable-next-line no-inline-html -->
+<a name="linux-install-instructions"></a>
+
 ### Linux
 
 #### Experimental: install from source helper script