Closes #131 Implement Alt Text for Visually Impaired Users

[schmetti-kim]

• Added descriptive alt-text to images in README.Rmd and vignettes/Building_Specification_Readers.Rmd
• Regenerated README.md via devtools::build_readme()
• Verified that pkgdown::build_site() no longer yields alt-text warnings

Click to expand pkgdown build logs

> pkgdown::build_site()
── Installing package metacore into temporary library ─────────────────────
── Building pkgdown site for package metacore ──────────────────────────────────
Reading from: /fsx/home/kiseungh/metacore
Writing to: /fsx/home/kiseungh/metacore/docs
── Sitrep ──────────────────────────────────────────────────────────────────────
✖ Bootstrap 3 is deprecated; please switch to Bootstrap 5.
ℹ Learn more at
  <https://www.tidyverse.org/blog/2021/12/pkgdown-2-0-0/#bootstrap-5>.
✖ URLs not ok.
  In _pkgdown.yml, url is missing.
  See details in `vignette(pkgdown::metadata)`.
✔ Favicons ok.
✔ Open graph metadata ok.
✔ Articles metadata ok.
✔ Reference metadata ok.
── Initialising site ───────────────────────────────────────────────────────────
── Building home ───────────────────────────────────────────────────────────────
Reading LICENSE.md
Reading README.md
Writing 404.html
── Building function reference ─────────────────────────────────────────────────
Reading man/MetaCore_filter.Rd
Reading man/check_columns.Rd
Reading man/check_structure.Rd
Reading man/check_words.Rd
Reading man/checks.Rd
Reading man/create_tbl.Rd
Reading man/define_to_metacore.Rd
Reading man/get_control_term.Rd
Reading man/get_keys.Rd
Reading man/is_DatasetMeta.Rd
Reading man/is_metacore.Rd
Reading man/load_metacore.Rd
Reading man/metacore.Rd
Reading man/metacore_example.Rd
Writing reference/metacore_example.html
Reading man/pipe.Rd
Reading man/read_all_sheets.Rd
Reading man/save_metacore.Rd
Reading man/select_dataset.Rd
Reading man/spec_to_metacore.Rd
Reading man/spec_type.Rd
Reading man/spec_type_to_codelist.Rd
Reading man/spec_type_to_derivations.Rd
Reading man/spec_type_to_ds_spec.Rd
Reading man/spec_type_to_ds_vars.Rd
Reading man/spec_type_to_value_spec.Rd
Reading man/spec_type_to_var_spec.Rd
Reading man/verify_DatasetMeta.Rd
Reading man/xml_to_codelist.Rd
Reading man/xml_to_derivations.Rd
Reading man/xml_to_ds_spec.Rd
Reading man/xml_to_ds_vars.Rd
Reading man/xml_to_value_spec.Rd
Reading man/xml_to_var_spec.Rd
── Building articles ───────────────────────────────────────────────────────────
Reading vignettes/Building_Specification_Readers.Rmd
Reading vignettes/Example.Rmd
── Building news ───────────────────────────────────────────────────────────────
── Building sitemap ────────────────────────────────────────────────────────────
── Checking for problems ───────────────────────────────────────────────────────
── Finished building pkgdown site for package metacore ─────────────────────────
── Finished building pkgdown site for package metacore ────────────────────
ℹ Previewing site

Closes #131

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.44%. Comparing base (197b67f) to head (965111a).
⚠️ Report is 28 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #133   +/-   ##
=======================================
  Coverage   85.44%   85.44%           
=======================================
  Files           8        8           
  Lines        1175     1175           
=======================================
  Hits         1004     1004           
  Misses        171      171           

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[LiamHobby]

Thanks a lot for this and for championing accessibility within the package :)