1. Try plaintext editor - it supports markdown.

2. No. If you think we need it - add your issue here?

3.  There is a button in the right corner (highlighted) - it uploads the image into the post/comment in place.

Usually, I need to adjust a width after that. I select it and click the button with an image (see the screenshot). Recommended maximum width is 700px for landscape and 300 for a portrait orientation.

4. Yes, I believe it works in markdown editor. Pinging our DC media manager @Anastasia Dyubaylo to describe how she is doing that.

5. We can introduce better if you know it. Suggest and editor or suggest the requirements to an editor - we will do that.

Just tried the installation on Cache for UNIX (Apple Mac OS X for x86-64) 2017.2 (Build 744U).

Installed in USER. works fine 

 

There is a note in installation:

Note that importing ClassExplorer.WebAppInstaller class will also create a /ClassExplorer application. If you want to create WEB application manually, please, do not import this class. Anyway, importing this class requires %SYS permission.

Maybe you have not enough rights to have everything installed properly? 

Containers were invented for it. 

The idea is that you have a git repo with docker container in it and a new developer can just checkout the repo and call "docker build" or even "docker up" to get the full prepared environment with one server in a container, two servers for client-server apps, and more for complex solutions.

See @Luca Ravazzolo posts on (one, two) on containers with InterSystems.  Also, see @Eduard Lebedyuk series on continuous delivery with Gitlab , it is a very related topic.