Example files, fix #175

[ZacZhangzhuo]

What type of change is this?

Request @Licini for a detailed review as this PR contains file naming and documentation operations.

• [x] Removing all the v120 prefixes of the files in the script folder.
• [x] Copying all the script files into example files, and making example pages.

Checklist

• [x] I added a line to the CHANGELOG.md file in the Unreleased section under the most fitting heading (e.g. Added, Changed, Removed).
• [x] I ran all tests on my computer and it's all green (i.e. invoke test).
• [x] I ran lint on my computer and there are no errors (i.e. invoke lint).
• [x] I have added necessary documentation (if appropriate)

[Licini]

Hey @ZacZhangzhuo These are great works! I'm now just nitpicking, I noticed some static images have a low resolution (or maybe compressed too much), for example this one for arrow docs\_images\example_arrows.jpg, could you replace them with better ones?

[ZacZhangzhuo]

Hey @ZacZhangzhuo These are great works! I'm now just nitpicking, I noticed some static images have a low resolution (or maybe compressed too much), for example this one for arrow docs\_images\example_arrows.jpg, could you replace them with better ones?

sure, :)