chore(main): release 2.1.0

:robot: I have created a release beep boop

core: adds new bim-tabs and bim-tab components (#10) (f5d32af)
core: adds search functionality bim-table (#16) (e46a789)
core: implements better searching and improves rendering for bim-table (#17) (6a06895)
core: improves css styling variables (ae14279)
core: optimizes table component (6abda24)
core: updates bim-panels-container, bim-panel and bim-panel-section behavior (#9) (b33f421)
core: updates documentation and tutorials (#20) (59e3def)
obc: adds a RelationsTree table component (#13) (8f051de)
obc: adds datacomputed event on ElementProperties (a912fcc)
obc: adds Relations Tree tutorial (f36705b)
obc: adds world configuration table component (#22) (25e1a16)
obc: creates an EntitiesAttributes component in @thatopen/ui-obc package (#7) (365197f)
obc: improves some obc components (#11) (4ce9c36)
obc: updates bim-world-2d (#21) (69d4225)
obc: updates elementProperties (#12) (308b575)
obc: updates tutorials (9fda824)
obc: updates tutorials (#19) (a2cf9f0)
restructure repo to use yarn and to work with docs (fe3b4fd)

core: fixes some minor details on base components (24c41fa)
core: sets styles when label is empty (08acd76)
obc: handles error on element properties table (3cdd92d)
obc: updates element properties and relations tree templates (0536cbc)
obc: updates resources paths to be absolute (048cae3)

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