add documentation for new path tool

[melonora]

References and relevant issues

#7099

Description

This PR adjust the documentation to include documentation for the new path tool. The old path tool is now called add polyline tool. Documentation has been adjusted to also reflect this.

[psobolewskiPhD]

Looks good, I made a few suggestions.

The "details" blocks look duplicated? maybe we should just have one?
I assume we could have a anchor to link to it from the lasso tool?

[melonora]

Looks good, I made a few suggestions.

The "details" blocks look duplicated? maybe we should just have one? I assume we could have a anchor to link to it from the lasso tool?

Thanks @psobolewskiPhD, I adjusted by adding a template markdown file in _templates that contains the section in the dropdown menu for both the lasso and path tool.

[psobolewskiPhD]

I think I still slightly lean towards one dropdown box explaining the details, since they are the same.
I think you can do

:::{dropdown} foo
:name: foo-bar

::::

and then link to the box using `[my text](#foo-bar)`

[jni]

Most of the comments were addressed so I'm going to merge this so we can get the 0.5.6 release done. Further improvements to formatting can happen in subsequent PRs.