feat: make logo link point to welcome page

[mistercrunch]

SUMMARY

New that we have a home page, let's point the logo to it

[codecov-io]

Codecov Report

Merging #11519 into master will increase coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #11519      +/-   ##
==========================================
+ Coverage   66.57%   66.63%   +0.05%     
==========================================
  Files         873      873              
  Lines       41777    41767      -10     
  Branches     3826     3826              
==========================================
+ Hits        27814    27832      +18     
+ Misses      13861    13833      -28     
  Partials      102      102              

Flag	Coverage Δ
cypress	55.80% <ø> (+0.33%)	⬆️
javascript	62.64% <ø> (ø)
python	62.09% <ø> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
superset/views/base.py	73.19% <ø> (+0.13%)	⬆️
.../src/dashboard/components/gridComponents/Chart.jsx	85.71% <0.00%> (+1.02%)	⬆️
...t-frontend/src/dashboard/actions/dashboardState.js	68.18% <0.00%> (+1.29%)	⬆️
...perset-frontend/src/messageToasts/actions/index.ts	95.83% <0.00%> (+8.33%)	⬆️
...et-frontend/src/messageToasts/components/Toast.tsx	100.00% <0.00%> (+8.33%)	⬆️
...rontend/src/visualizations/FilterBox/FilterBox.jsx	68.75% <0.00%> (+10.62%)	⬆️

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[nytai]

Additionally, should we also make the home page route / and redirect /superset/welcome there to preserve old links? I'm not sure of the history here. I always thought the lack of any content on / a bit strange.

[mistercrunch]

@nytai I think the reason is that it's a bit of a puzzle around how FAB does things and issues around python circular imports. I don't think it's super hard put requires a bit of thinking / refactoring.

[rusackas]

Adjusting the route was on our radar for follow-up, when the moon is right. I'd actually wondered if it could just be at /superset instead of /superset/welcome

The other quandry is if/when we want to add profile/role information to the homepage (perhaps as a sidebar, perhaps as a hero/header) to replace the feature of the user page you could previously get to by clicking the logo.

... or maybe that should all be shoved under the user/account menu in the top right somehow. ¯\_(ツ)_/¯

[ktmud]

Should we plan adding user profile picture as well? Maybe use gravatar.com to get started?