Explaining the "Style Lockdown" (#940)

* First pass at a contribution guide for the website. Suggestions are welcome.

* Attempt to make the WebHost change guide describe the intent of the style restrictions more accurately.

* Try to improve the explanation of the intention behind the style restrictions.

WebHostLib/README.md

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+# WebHost
+
+## Contribution Guidelines
+**Thank you for your interest in contributing to the Archipelago website!**  
+Much of the content on the website is generated automatically, but there are some things
+that need a personal touch. For those things, we rely on contributions from both the core
+team and the community. The current primary maintainer of the website is Farrak Kilhn.
+He may be found on Discord as `Farrak Kilhn#0418`, or on GitHub as `LegendaryLinux`.
+
+### Small Changes
+Little changes like adding a button or a couple new select elements are perfectly fine.
+Tweaks to style specific to a PR's content are also probably not a problem. For example, if
+you build a new page which needs two side by side tables, and you need to write a CSS file
+specific to your page, that is perfectly reasonable.
+
+### Content Additions
+Once you develop a new feature or add new content the website, make a pull request. It will
+be reviewed by the community and there will probably be some discussion around it. Depending
+on the size of the feature, and if new styles are required, there may be an additional step
+before the PR is accepted wherein Farrak works with the designer to implement styles.
+
+### Restrictions on Style Changes
+A professional designer is paid to develop the styles and assets for the Archipelago website.
+In an effort to maintain a consistent look and feel, pull requests which *exclusively*
+change site styles are rejected. Please note this applies to code which changes the overall
+look and feel of the site, not to small tweaks to CSS for your custom page. The intention
+behind these restrictions is to maintain a curated feel for the design of the site. If
+any PR affects the overall feel of the site but includes additive changes, there will
+likely be a conversation about how to implement those changes without compromising the
+curated site style. It is therefore worth noting there are a couple files which, if
+changed in your pull request, will cause it to draw additional scrutiny.
+
+These closely guarded files are:
+- `globalStyles.css`
+- `islandFooter.css`
+- `landing.css`
+- `markdown.css`
+- `tooltip.css`
+
+### Site Themes
+There are several themes available for game pages. It is possible to request a new theme in
+the `#art-and-design` channel on Discord. Because themes are created by the designer, they
+are not free, and take some time to create. Farrak works closely with the designer to implement
+these themes, and pays for the assets out of pocket. Therefore, only a couple themes per year
+are added. If a proposed theme seems like a cool idea and the community likes it, there is a
+good chance it will become a reality.