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/item/download-buttons.html

@@ -13,7 +13,7 @@
     {% if page.date %}{%- capture year -%}{% if page.date contains "-" %}{{ page.date | split: "-" | first }}{% elsif page.date contains "/" %}{{ page.date | split: "/" | last }}{% else %}{{ page.date }}{% endif %}{%- endcapture -%}
     <a href="{{ year | strip | prepend: '/timeline.html#y' | relative_url }}" class="btn btn-outline-primary">View on Timeline</a>{% endif %}
     {% if page.latitude and page.longitude %}
-    <a href="{{ '/map.html?location=' | append: page.latitude  | append: ',' | append: page.longitude | append: '&marker=' | append: page.objectid | relative_url }}" class="btn btn-outline-primary">View on Map</a>{% endif %}
+    <a href="{{ '/map/?location=' | append: page.latitude  | append: ',' | append: page.longitude | append: '&marker=' | append: page.objectid | relative_url }}" class="btn btn-outline-primary">View on Map</a>{% endif %}
     {% if page.object_location %}<a target="_blank" rel="noopener" href="{{ page.object_location | relative_url }}" class="btn btn-outline-primary">
         {% if page.display_template == 'video' and page.object_location contains 'vimeo' %}View on Vimeo{% elsif page.display_template == 'video' and page.object_location contains 'youtu' %}View on YouTube{% elsif page.display_template == 'record'%}Link to Object{% else %}Download {{ page.format | split: '/' | last | default: page.display_template | upcase }}{% endif %}
     </a>{% endif %}