Speak-32 Add search algorithm

[tuul-wq]

Resolves #32

Description of changes in this PR Enabled Search component which has 2 autocomplete fields with a prepopulated dropdown. Fields can be cleared with a cross icon. In case no speakers were found we show NoResultscomponent with corresponding text (translation required). Also adjusted spinner center align as well as margin values to be similar with NoResultscomponent to eliminate footer jumping. Moved PaginationRowin title row, to remove jumping between search form and pagination widget.

How do the reviewers QA this?

• [x] User can search by topics or locations or both of them.
• [x] Each search requests a new speakers list.
• [x] If filtered results contain more than 50 items, pagination will take place.
• [ ] Search applies on blur and clear events (from code perspective it's a @change event).

[tuul-wq]

@ann-kilzer resolved kebab conflict; added more info for QA.

[tuul-wq]

@ann-kilzer updated PR

[tuttiq]

Hi @tuul-wq ! Any plans to come back to this PR?