Enable ignoring HTML classes

[mdbrnowski]

This PR adds support for ignoring all HTML class attributes during content comparison, controlled by a new ignore_classes option in the configuration.

[Copilot]

Pull request overview

Adds an ignore_classes option to HTML normalization so that content comparison can ignore all HTML class attributes on remaining elements (after applying ignore selectors), enabling more stable diffs for class-heavy pages.

Changes:

• Extend page configuration to include ignore_classes (parsed from TOML, defaulting to False).
• Thread ignore_classes through the Gleam server code into the Elixir/Floki HTML normalization implementation.
• Update and add tests to cover both class-stripping and non-stripping behavior.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
test/server_test.gleam	Updates comparable-content tests for the new parameter; adds coverage for class stripping on/off.
src/ciele/server.gleam	Threads ignore_classes into comparable content generation; updates public API arity.
src/ciele/html.ex	Implements conditional stripping of class attributes via Floki traversal.
src/ciele/config.gleam	Extends Page config/type and TOML parsing to support ignore_classes.
gleam.toml	Bumps package version.
config/config.example.toml	Demonstrates the new ignore_classes configuration option.

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