Add base step to application creation.

[KlapTrap]

Remove the deploy application from the application wall and instead have a single create button that takes the user to a page where they can select their desired creation type.

[cfdreddbot]

✅ Hey KlapTrap! The commit authors and yourself have already signed the CLA.

[codecov]

Codecov Report

Merging #3461 into v2-master will increase coverage by 0.17%.
The diff coverage is 82.05%.

@@              Coverage Diff              @@
##           v2-master    #3461      +/-   ##
=============================================
+ Coverage      51.44%   51.61%   +0.17%     
=============================================
  Files            697      701       +4     
  Lines          19418    19505      +87     
  Branches        3428     3455      +27     
=============================================
+ Hits            9989    10068      +79     
- Misses          9429     9437       +8

[richard-cox]

Haven't seen the updated code yet but tested each type, everything worked fine except..
gitlab -

• select a valid project - missing project icon (shows missing image graphic)
• select an invalid project - exception thrown

core.js:15714 ERROR TypeError: Cannot read property 'logger' of undefined
   at parseHttpPipeError (utils.service.ts:243)
   at createFailedGithubRequestMessage (deploy-app.effects.ts:37)
   at CatchSubscriber.selector (deploy-app.effects.ts:105)

deploy from folder

• when deploying quick app instance crashes with 1bash: ./app.sh: Permission denied
• we may be clearing file permissions again

These, especially the second, could already be an issue in master

[KlapTrap]

I haven't fundamentally changed how the deploy works so I would imagine those are issues on master too.