fix: literature and projects tables now stay in the same row than filters; download button in literature now does not expland to its div width

feat(#13): in literature, add extra hidden colums to make a usable CSV when downloading the table; put back the manual curation disclaimers and last update date

refactor(#16): avoid loading several times the datatables js/css bundles; load them only once in head.html and foot.html

style(#16): edit buttons avoiding EBI-like style; correct behaviour when hover on sections links on second navbar

style(#16): apply some style on search inputs in datatables; place search boxes and download buttons in the same row next to each other

refactor(#16): unify /images/resources/ filenames convention to kebab-case (edited 'inb-curated-covid19dataportal-data' google spreadsheet)

fix(#16): correct visibility of hamburger menu on mobile; place links without dropdown in top navbar; replace country flags with 'en | es'

refactor(#4): replaced and cleanup styles.css by several _modules.scss in assets/sass/; refactor(images): relocate image resources (png, svg) into new directory images/, rename images following the easy-to-write kebab-case-convetion; refactor(proposal): change style of cards in resources section

refactor: change user consent acceptance from localStorage to document.cookie; feat(ui): change appearance of all call-to-action buttons (for example, 'Download table as CSV')

feat: change color palette to match european portal color palette, using CSS custom properties (variables); fix some padding inconsistencies across sections

refactor!(#5): deep re-structuring of the whole HUGO project; more descriptive filenames in both content and layouts; add contrast color and underline in active section inside the top menu; remove breadcrumbs and banner for every section