docs: Improve consistency

[fsbraun]

Summary by Sourcery

New Features:

• Prepare for a new release with version 2.1.0

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request updates the package version and changelog.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Updated the package version.	Incremented the package version from 2.0.0 to 2.1.0.	djangocms_frontend/__init__.py
Updated the changelog.	Added a new entry to the changelog.	CHANGELOG.rst

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[sourcery-ai]

We encountered an error and are unable to review this PR. We have been notified and are working to fix it.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.69%. Comparing base (ebedc46) to head (515995e).
Report is 22 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #265   +/-   ##
=======================================
  Coverage   88.69%   88.69%           
=======================================
  Files         124      124           
  Lines        3360     3360           
  Branches      283      283           
=======================================
  Hits         2980     2980           
  Misses        263      263           
  Partials      117      117           

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