chore: Prepare 2.1 release

[fsbraun]

Summary by Sourcery

Chores:

• Update package version to 2.1.0.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request prepares the project for the 2.1 release. It updates the version number in djangocms_frontend/__init__.py and updates the CHANGELOG.rst file.

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

File-Level Changes

Change	Details	Files
Bumped the version number to 2.1.0.	Updated the version variable to 2.1.0.	djangocms_frontend/__init__.py
Updated the changelog.	Added a new section for the 2.1 release.	CHANGELOG.rst

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[sourcery-ai]

Hey @fsbraun - I've reviewed your changes - here's some feedback:

Overall Comments:

• Ensure the changelog reflects all significant changes since the last release.

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.69%. Comparing base (609a145) to head (c5bd098).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #264   +/-   ##
=======================================
  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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