rename the project from mediawiki_dump_tools to wikiq

wikiq is what the tool is called, what people type, and what they would
search for; mediawiki_dump_tools was only ever the name of the directory
it lived in. The repository is being renamed on gitea and github to
match, so rename the distribution with it.

This also settles the name to claim on PyPI. The metadata lookup that
backs --version takes the distribution name as a literal, so it changes
here too, along with the install command wikiq prints when -p legacy is
used without its extra.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

README.md

@@ -1,4 +1,4 @@
-# mediawiki_dump_tools
+# wikiq
 
 Tools for converting MediaWiki XML database dumps—the "history" dumps
 that include every revision of every page—into tabular datasets for
@@ -12,8 +12,8 @@ optional computed columns.
 wikiq requires Python 3.11 or later. Install it with pip from a clone of
 this repository:
 
-    git clone https://gitea.communitydata.science/collective/mediawiki_dump_tools.git
-    cd mediawiki_dump_tools
+    git clone https://gitea.communitydata.science/collective/wikiq.git
+    cd wikiq
     pip install .
 
 [uv](https://docs.astral.sh/uv/) works too (`uv sync`) and is convenient