Install python3-sphinx-rtd-theme to fix warning #195

Job	Run time
Generate languages list	11s
Build the documentation (cs)	42s
Build the documentation (ja)	38s
Build the documentation (bn)	40s
Build the documentation (fr)	40s
Build the documentation (pl)	28s
Build the documentation (ka)	35s
Build the documentation (sv)	36s
Build the documentation (nl)	33s
Build the documentation (tr)	48s
Build the documentation (fi)	39s
Build the documentation (ca)	37s
Build the documentation (it)	40s
Build the documentation (gl)	30s
Build the documentation (ro)	45s
Build the documentation (es)	39s
Build the documentation (de)	1m 0s
Build the documentation (hr)	37s
Build the documentation (lt)	39s
Build the documentation (hu)	32s
Build the documentation (da)	32s
Build the documentation (zh_TW)	40s
Build the documentation (ar)	40s
Build the documentation (nb)	44s
Build the documentation (zh_CN)	45s
Build the documentation (sk)	40s
Build the documentation (pt_BR)	38s
Build the documentation (mn)	39s
Build the documentation (en_GB)	38s
Build the documentation (sl)	44s
Build the documentation (ko)	33s
Build the documentation (pt_PT)	42s
Build the documentation (sq)	49s
Build the documentation (az)	36s
Build the documentation (hy)	35s
Build the documentation (rcf)	37s
Build the documentation (si)	38s
Build the documentation (bs)	42s
Build the documentation (mk)	50s
Build the documentation (fy)	44s
Build the documentation (vi)	46s
Build the documentation (id)	38s
Build the documentation (et)	34s
Build the documentation (uk)	40s
Build the documentation (ru)	33s
Build the documentation (el)	32s
Build the documentation (eo)	37s
	30m 15s

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