move pytest catalog entry under python (#612)

Author: dwgrth

website/catalog/index.md

@@ -19,10 +19,10 @@ Feel free to join our [Discord](https://discord.gg/4YZjf6htSQ) channel and ask @
   * [Prefer Generator Expressions](/catalog/python/#prefer-generator-expressions)
   * [Remove `async` function](/catalog/python/#remove-async-function)
   * [Rewrite `Optional[Type]` to `Type | None`](/catalog/python/#rewrite-optional-type-to-type-none)
+  * [Refactor pytest fixtures](/catalog/python/#refactor-pytest-fixtures)
 * [Ruby](/catalog/ruby/)
   * [Prefer Symbol over Proc](/catalog/ruby/#prefer-symbol-over-proc)
   * [Migrate action_filter in Ruby on Rails](/catalog/ruby/#migrate-action-filter-in-ruby-on-rails)
-  * [Refactor pytest fixtures](/catalog/python/#refactor-pytest-fixtures)
 * [Rust](/catalog/rust/)
   * [Avoid Duplicated Exports](/catalog/rust/#avoid-duplicated-exports)
   * [Get number of digits in a `usize`](/catalog/rust/#get-number-of-digits-in-a-usize)
@@ -39,4 +39,4 @@ Feel free to join our [Discord](https://discord.gg/4YZjf6htSQ) channel and ask @
   * [Rewrite MobX Component Style](/catalog/tsx/#rewrite-mobx-component-style)
   * [Unnecessary React Hook](/catalog/tsx/#avoid-unnecessary-react-hook)
 * [Java](/catalog/java/)
-  * [No Unused Vars](/catalog/java/#no-unused-vars)
+  * [No Unused Vars](/catalog/java/#no-unused-vars)