This pull request updates the documentation and configuration to reference the final release of Ruby on Rails 8.1.0 instead of the previous release candidate (8.1.0.rc1). It also updates all relevant version strings and GitHub source links to match the new Rails submodule commit.

Key changes include:

Rails version update:

• Updated the default Rails version and all visible references from "8.1.0.rc1" to "8.1.0" in _config.yml and across generated documentation HTML files. [1] [2] [3] [4] [5] [6] [7] [8]

Rails submodule update:

• Updated the rails submodule to point to the latest commit for Rails 8.1.0 final release.

Documentation source links:

• Updated all GitHub source code links in the documentation to reference the new Rails commit, ensuring that "See on GitHub" URLs point to the correct lines in the 8.1.0 release codebase. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20]