[docs] refactor: full rewrite, generalization + dedup

Combines most of the stuff that was repeated thrice over verbatim into a
single common Build Instructions page, with additional caveats marked
elsewhere. Prettifies some stuff too because why not.

Signed-off-by: crueter <crueter@eden-emu.dev>

docs/scripts/Linux.md

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+# Linux Build Scripts
+
+* Provided script: `.ci/linux/build.sh`
+* Must specify arch target, e.g.: `.ci/linux/build.sh amd64`
+* Valid targets:
+  * `native`: Optimize to your native host architecture
+  * `legacy`: x86\_64 generic, only needed for CPUs older than 2013 or so
+  * `amd64`: x86\_64-v3, for CPUs newer than 2013 or so
+  * `steamdeck` / `zen2`: For Steam Deck or Zen >= 2 AMD CPUs (untested on Intel)
+  * `rog-ally` / `allyx` / `zen4`: For ROG Ally X or Zen >= 4 AMD CPUs (untested on Intel)
+  * `aarch64`: For armv8-a CPUs, older than mid-2021 or so
+  * `armv9`: For armv9-a CPUs, newer than mid-2021 or so
+* Extra CMake flags go after the arch target.
+
+### Environment Variables
+
+* `NPROC`: Number of compilation threads (default: all cores)
+* `TARGET`: Set `appimage` to disable standalone `eden-cli` and `eden-room`
+* `BUILD_TYPE`: Build type (default: `Release`)
+
+Boolean flags (set `true` to enable, `false` to disable):
+
+* `DEVEL` (default `FALSE`): Disable Qt update checker
+* `USE_WEBENGINE` (default `FALSE`): Enable Qt WebEngine
+* `USE_MULTIMEDIA` (default `FALSE`): Enable Qt Multimedia
+
+* AppImage packaging script: `.ci/linux/package.sh`
+
+  * Accepts same arch targets as build script
+  * Use `DEVEL=true` to rename app to `Eden Nightly`
+  * This should generally not be used unless in a tailor-made packaging environment (e.g. Actions/CI)

docs/scripts/Windows.md

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+# Windows Build Scripts
+
+* A convenience script for building is provided in `.ci/windows/build.sh`.
+* You must run this with Bash, e.g. Git Bash or the MinGW TTY.
+* To use this script, you must have `windeployqt` installed (usually bundled with Qt) and set the `WINDEPLOYQT` environment variable to its canonical Bash location:
+  * `WINDEPLOYQT="/c/Qt/6.9.1/msvc2022_64/bin/windeployqt6.exe" .ci/windows/build.sh`.
+* You can use `aqtinstall`, more info on <https://github.com/miurahr/aqtinstall> and <https://ddalcino.github.io/aqt-list-server/>
+
+
+* Extra CMake flags should be placed in the arguments of the script.
+
+#### Additional environment variables can be used to control building:
+
+* `BUILD_TYPE` (default `Release`): Sets the build type to use.
+
+* The following environment variables are boolean flags. Set to `true` to enable or `false` to disable:
+
+  * `DEVEL` (default FALSE): Disable Qt update checker
+  * `USE_WEBENGINE` (default FALSE): Enable Qt WebEngine
+  * `USE_MULTIMEDIA` (default FALSE): Enable Qt Multimedia
+  * `BUNDLE_QT` (default FALSE): Use bundled Qt
+
+  * Note that using **system Qt** requires you to include the Qt CMake directory in `CMAKE_PREFIX_PATH`
+    * `.ci/windows/build.sh -DCMAKE_PREFIX_PATH=C:/Qt/6.9.0/msvc2022_64/lib/cmake/Qt6`
+
+* After building, a zip can be packaged via `.ci/windows/package.sh`. You must have 7-zip installed and in your PATH.
+  * The resulting zip will be placed into `artifacts` in the source directory.
+
+
+## 🖥️ Method III: CLion Environment Setup
+
+### a. Prerequisites to CLion
+
+* [CLion](https://www.jetbrains.com/clion/) - This IDE is not free; for a free alternative, check Method I
+
+---
+
+### b. Cloning eden with CLion
+
+* Clone the Repository:
+
+<img src="https://user-images.githubusercontent.com/42481638/216899046-0d41d7d6-8e4d-4ed2-9587-b57088af5214.png" width="500">
+<img src="https://user-images.githubusercontent.com/42481638/216899061-b2ea274a-e88c-40ae-bf0b-4450b46e9fea.png" width="500">
+<img src="https://user-images.githubusercontent.com/42481638/216899076-0e5988c4-d431-4284-a5ff-9ecff973db76.png" width="500">
+
+---
+
+### c. Building & Setup
+
+* Once Cloned, You will be taken to a prompt like the image below:
+
+<img src="https://user-images.githubusercontent.com/42481638/216899092-3fe4cec6-a540-44e3-9e1e-3de9c2fffc2f.png" width="500">
+
+* Set the settings to the image below:
+* Change `Build type: Release`
+* Change `Name: Release`
+* Change `Toolchain Visual Studio`
+* Change `Generator: Let CMake decide`
+* Change `Build directory: build`
+
+<img src="https://user-images.githubusercontent.com/42481638/216899164-6cee8482-3d59-428f-b1bc-e6dc793c9b20.png" width="500">
+
+* Click OK; now Clion will build a directory and index your code to allow for IntelliSense. Please be patient.
+* Once this process has been completed (No loading bar bottom right), you can now build eden
+* In the top right, click on the drop-down menu, select all configurations, then select eden
+
+<img src="https://user-images.githubusercontent.com/42481638/216899226-975048e9-bc6d-4ec1-bc2d-bd8a1e15ed04.png" height="500" >
+
+* Now run by clicking the play button or pressing Shift+F10, and eden will auto-launch once built.
+
+<img src="https://user-images.githubusercontent.com/42481638/216899275-d514ec6a-e563-470e-81e2-3e04f0429b68.png" width="500">
+
+---
+
+
+