Missing `pkgdown` topics raise error in `build_reference()`

[jasonratcliff]

Error raised by pkgdown version update from renv upgrade:

Error in check_missing_topics(rows, pkg): All topics must be included in reference index
✖ Missing topics: annotation_legend, bayes_ggtree, bayes_kable, bayes_plot, bayes_themes, beast_labels, beast_legend_color, beast_legend_probability, beast_plot, beast_posterior, beast_theme, build_map, capitalize, conserved_vouchers, count_specimens, filter_reviewed, find_spp, haplotype_labels, html_caption, italicize, jitter_violin, join_bayes, knitr_section, knitr_table_dna, layer_borders, layer_elevation, layer_ggmap, layer_specimens, layer_themes, map_trait_distribution, msa_intervals, msa_texshade, msa_wrapper, node_geoms, node_labels, parse_taxa, potentially_informative_sites, range_split, read_tree, repel_haplotype_labels, repel_map_labels, repel_node_labels, save_plot, separate_discrete_trait, species_plot, spl_bbox, spl_id, spl_labels, spl_legend, spl_order, spl_states, spp_co_front_range, spp_color, spp_shape, subset_coords, trait_phenology
ℹ Either add to _pkgdown.yml or use @keywords internal

Functions without _pkgdown.yml specification need #' @keywords internal added to roxygen documentation.