refine walkthrough steps

[Eskibear]

As discussed, we will have 4 steps for users to follow:

• create a new project/open a sample project
• explore projects, e.g. view symbols
• run projects
• view live information

I'll update SVG files with new commits once they are ready.

[Eskibear]

Changes in cf7043e :

• Step 1: add a button to git.clone(vscode's command) petclinic into a location you choose. vscode handles the UX.
• Step 2: remove the instruction about adding "@" in the workspace symbols inputbox as we now pre-input "#@" when you click the command.
• Step 3: add a button to run the project
• Step 4: add buttons to open beans and mappings views. Memory view is not showing all the time, we can show the memory graph in the image, telling users that we have this fancy feature.

[martinlippert]

The changes look good to me, just missing the SVG files.

[Tanyatang0]

Here are the SVG files.
Step1_commandPalette

Step2_Explore your project

Step3_Run your project

Step4_View live information from your running application

Attached is the image zip file. @Eskibear
Steps image file.zip

[Eskibear]

@martinlippert I just updated the themed SVGs (particularly optimized for not being strange in all built-in themes). Please take a look.

[martinlippert]

Looks all good to me. Let's merge this.