[common-assets & openaire-theme & Library | new-theme]: Updated class for graph color and moved to openaire.css | z-index fixes in dropdown and in landing pages.

1. dropdown.css: [Bug fix] Added z-index: 1 in uk-dropdown to prevent dropdown from being on top of menu.
2. text.css: Removed classes "text-orcid" and "text-argos" (moved to openaire-theme/css/openaire.css.
3. openaire.css: Removed class "graph" and added "text-graph", "text-orcid", "text-argos".
4. dataProvider.component.html & organization.component.html & project.component.html & resultLanding.component.html & newSearchPage.component.html: Use class "text-graph" instead of "graph" for graph color.
5. landing-utils.css: [Bug fix] Updated z-index of #graph_and_feedback to 980 (previous 979) to be on top of tabs in landing pages | background of #main-tabs-div was set twice.

explore/src/app/openaireLibrary

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-Subproject commit a89710765e951a148fe89dba73267fe3523c56ed
+Subproject commit ed7e66852a64babc4e48573ed52b6ba114a2ea84

explore/src/assets/common-assets

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-Subproject commit 828b3c497335f14e6a4e8e91dad2577ee7d54fdd
+Subproject commit 2b7e2d4cc0de56fc6a5868e15c5209b4e27c058d

explore/src/assets/openaire-theme

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-Subproject commit fb8db8d1d2bba0f68b52dc98996fd9f979c8aa63
+Subproject commit bd15bab85dde4018155a631d9cf6ecdfe98ebe9a