Fix adding new data source and minor updates

[mikhail-vl]

No description provided.

[codecov]

Codecov Report

Merging #68 (1ddac72) into master (7e7167f) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #68   +/-   ##
=======================================
  Coverage   96.63%   96.63%           
=======================================
  Files          47       47           
  Lines         742      742           
  Branches      150      150           
=======================================
  Hits          717      717           
  Misses         10       10           
  Partials       15       15           

Impacted Files	Coverage Δ
...c/components/data-source-list/data-source-list.tsx	100.00% <100.00%> (ø)
src/components/root-page/root-page.tsx	88.88% <100.00%> (ø)

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[mikhail-vl]

Looks good!