Doc: add change history to documentation (Infra)

[tang-mm]

Description

Add a change history page in the Checkbox reference docs, containing a link to the GitHub Releases page.

This initial version of change history is a copy of the GitHub-generated release notes. With the implementation of PR title validation, further changes to this page should be improved into an integrated action within the release process.

Resolved issues

CHECKBOX-846

Documentation

Tests

1. In the docs/ folder, build the documentation set locally by running:

$ make install
$ make run

2. Go to http://127.0.0.1:8000/reference/changes

[yphus]

tested locally, the changelog renders very well, thx.

[tang-mm]

appended a commit to fix spelling check errors

[kissiel]

Some of the lines you've added don't end with a blank space, and from what I can tell, the existing ones do. I pointed out one easy to spot below.
I'd like to know if there's a reason to have them, if not, I'll gladly trim all of them.

[tang-mm]

Following the discussion in MM, the initial changelog only contains a link for consistency and maintenance purposes. Further content should be generated through automation in the release process.

(removed docs/.wordlist.txt because it is replaced by docs/sphinx/wordlist.txt)

[Hook25]

Ty for the contribution and removing that old wordlist as well