docs: updated walkthrough documentation

[Yubo-Cao]

Closes N/A
Refs: #13039

• Updated every screenshot using the latest version of IntelliJ
• Removed the section on "Right Click > Module settings > Project > SDK." The old approach still works.
• Renamed all the screenshots currently in use to comply with \d{2}-\d{2}-(\w+-)+\w+.png new naming convention
• Removed all the screenshots that are not used

Mandatory checks

• I own the copyright of the code submitted and I license it under the MIT license
• Change in CHANGELOG.md described in a way that is understandable for the average user (if change is visible to the user)
• Tests created for changes (if applicable)
• Manually tested changed features in running JabRef (always required)
• Screenshots added in PR description (if change is visible to the user)
• Checked developer's documentation: Is the information available and up to date? If not, I outlined it in this pull request.
• Checked documentation: Is the information available and up to date? If not, I created an issue at https://github.com/JabRef/user-documentation/issues or, even better, I submitted a pull request to the documentation repository.

[trag-bot]

@trag-bot didn't find any issues in the code! ✅✨

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If you made changes that are visible to the user, please add a brief description along with the issue number to the CHANGELOG.md file. If you did not, please replace the cross ([x]) by a slash ([/]) to indicate that no CHANGELOG.md entry is necessary. More details can be found in our Developer Documentation about the changelog.