Cleanup Categories

* [ ] Move "archaeology" category into "history"
* [ ] Create a new "LFE Friday" category and move all those posts
* [ ] Rename "update" to "updates"
* [ ] Move "reports" into "updates"
* [ ] Move "holidays" into "updates"
* [ ] Move "excerpts" into "history"
* [ ] Rename "design" to "language design"
* [ ] Rename "interview" to "interviews"
* [ ] Move "news" into "updates"