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/content.html

@@ -32,7 +32,7 @@
         {%- assign count = templates | where_exp: 'item', 'item contains t' | size -%}
         {% if count > 0 %}
         {{ count }}
-        <a class="text-dark" href="{{ '/browse.html' | relative_url }}#display_template:{{ t }}">{{ t | upcase | replace: "_", " " }} 
+        <a class="text-dark" href="{{ '/browse/' | relative_url }}#display_template:{{ t }}">{{ t | upcase | replace: "_", " " }} 
         {% include helpers/get-icon-svg.html type="hidden" template=t %}</a><br>
         {%- endif -%}
         {%- endfor -%}
@@ -40,7 +40,7 @@
         {{ others }} OTHER {% include helpers/get-icon-svg.html type="hidden" %}<br>{% endif %}{% endif %}
         {% if include.total == true %}
         {{ templates | size }} TOTAL ITEMS<br>{% endif %}
-        <a class="btn btn-sm btn-{{ include.btn-color | default: 'outline-secondary' }} mt-2" href="{{ '/data.html' | relative_url }}">View table</a>
+        <a class="btn btn-sm btn-{{ include.btn-color | default: 'outline-secondary' }} mt-2" href="{{ '/data/' | relative_url }}">View table</a>
         </p>
     </div>
 </div>