Addressing JOSS review comments

[giswqs]

This issue is for addressing the JOSS reviewers' comments. openjournals/joss-reviews#2965

[amanaster2]

JOSS review comment

Installation instruction suggestions:

• Need clarity regarding which method to use for installing (mamba vs. pip). I was not able to get the mamba installation of lidar working on either computer I tried it on. It would be safer to assume that folks don't have the necessary dependencies (i.e., GDAL, richdem) already installed, especially if they're creating a new environment.
• Include the Dependencies section of documentation with the Installation section for ease of use.
• Under Dependencies, the Windows subsection is essentially a repeat of the initial command provided in the section. Suggest either removing one of the commands or making the commands the same. (Second command has pip install richdem, and I found that pip install lidar gives richdem, so that line isn't necessary.)