Update documentation and permalinks for consistency and clarity

- Changed references in markup.md to update "data.html" to "data/" for clarity.
- Updated metadata.md to correct the link to the general documentation.
- Modified navbar.md to ensure stub values match the new permalink structure.
- Adjusted tables.md to reflect the new permalink for the table visualization page.
- Updated about.md to change the permalink from "/about.html" to "/about/" and revised content for clarity and impact.
- Changed browse.md permalink from "/browse.html" to "/browse/" for consistency.
- Added copyright.md page with copyright information and terms of use.
- Updated data.md to change permalink from "/data.html" to "/data/" and added introductory content.
- Created donate.md page to facilitate donations and acknowledge supporters.
- Updated locations.md permalink from "/locations.html" to "/locations/" for consistency.
- Changed map.md permalink from "/map.html" to "/map/" for uniformity.
- Added erasure.md page discussing the historical context of Black queer Kansas Citians.
- Updated out-there.md to correct the link to Lea Hopkins' interview.
- Changed subjects.md permalink from "/subjects.html" to "/subjects/" for consistency.
- Updated timeline.md permalink from "/timeline.html" to "/timeline/" for uniformity.

_includes/index/data-download.html

@@ -13,7 +13,7 @@
 {%- assign stubs = site.data.config-nav | map: 'stub' | join: ';' -%}
 <div class="card mb-3">
     <div class="card-body">
-        <p><small>Download this collection's metadata in a variety of reusable formats. Beware of this archive's copyright information!</small></p>
+        <p><small>Download this collection's metadata in a variety of reusable formats. Psst: <a href="/copyright/" target="_blank">check out this archive's copyright information before downloading!</a></small></p>
         <p class="card-text text-center">
             <a class="btn btn-sm btn-secondary m-1" href="{{ '/assets/data/metadata.csv' | relative_url }}" download>Metadata CSV</a>
             <a class="btn btn-sm btn-secondary m-1" href="{{ '/assets/data/metadata.json' | relative_url }}" target="_blank">Metadata JSON</a>