Turns out tagging items is a much faster process than I thought. I've also hit some problems I wanted advice on.
First of all, every item has now been tagged with the 3 following signifiers
1) Source (DMG, TCE, etc. The full list can be seen at the top of http://dnd5e.wikidot.com/wondrous-items)
2) Rarity (common, uncommon, rare, very-rare, legendary, artifact, unique)
3) Item type (armor, potion, ring, rod, scroll, staff, wand, weapon, wondrous-item)
There's also the two additional signifiers as needed:
4) Attuned (if it requires any sort of attunement)
5) Homebrew (so far, only Legend of Runeterra and Tal'Dorei Campaign Setting are added, but more can be based on need)
More importantly, I've been tinkering on the page http://dnd5e.wikidot.com/magic-items to see how a table akin to our spells page would work, and I'm realizing that in addition to tags, we also need to have the tagged information hidden under the item descriptions just as spell information is hidden under spell descriptions. This is the only way to make the items page list anything other than the item's name. I can go back through and try to add that information in, but it will likely take a lot of time. It'll likely be formatted as follows (using the Potion of Climbing page as reference. Ignore quotation marks, it's just to work around CSS):
Source: Dungeon Master's Guide
Potion, common
When you drink this potion, you gain a climbing speed equal to your walking speed for 1 hour. During this time, you have advantage on Strength (Athletics) checks you make to climb. The potion is separated into brown, silver, and gray layers resembling bands of stone. Shaking the bottle fails to mix the colors.
"===="
[[include :snippets:suo BEGIN CODE |unique=first |type=showto]]
"===="
Potion
"===="
-
"===="
DMG
"===="
[[include :snippets:suo END CODE]]
If anyone who knows more about CSS than me can confirm if this should work if applied to the item pages so that the final magic items page will be able to list the relevant information, please let me know. I'm kind of just working on trial-and-error from the template of the spells page, so anyone with more experience giving me a nudge in the right direction would be appreciated.
Edit: So apparently adding the hidden item information is also not terribly difficult since, in the last 6 hours of on-and-off tinkering. I've already gotten through almost 500 items. The WIP page is also going well, as I've gotten it to categorize items by rarity. The problem is that from there, it can only sort the items alphabetically, and I can't figure out how to change it so that the page might sort the items by, for example, item type or source. If people are alright with the items being sorted alphabetically, that might be fine, but I'd prefer if they could be sorted in other ways. I've also gotten the page to separate the homebrew items from the published items, so I can make a page dedicated to items from the unofficial sources.
Anyways, I should be done adding the information to the items by tomorrow night, but I'd still appreciate some advice from CSS experts on how to sort the tables other than alphabetically.
Edit 2: Wow uh. All items now have their hidden info added to them. Again, faster than I thought.