Docs restructuring (#2638)

* Restructure

* Update nav

* Reorg

* Reshuffle ecosystem pages

* Split up runtime/runtime

* Back to runtime/index

* Fix issue

* Split up runtime/index

* Add Writing Tests page

* Prettier matcher table

* More updates

1 files changed, 190 insertions, 0 deletions

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+The `bun` CLI contains an `npm`-compatible package manager designed to be a faster replacement for existing package management tools like `npm`, `yarn`, and `pnpm`. It's designed for Node.js compatibility; use it in any Bun or Node.js project.
+
+{% callout %}
+
+**⚡️ 80x faster** — Switch from `npm install` to `bun install` in any Node.js project to make your installations up to 80x faster.
+
+{% image src="https://user-images.githubusercontent.com/709451/147004342-571b6123-17a9-49a2-8bfd-dcfc5204047e.png" height="200" /%}
+
+{% /callout %}
+
+{% details summary="For Linux users" %}
+The minimum Linux Kernel version is 5.1. If you're on Linux kernel 5.1 - 5.5, `bun install` should still work, but HTTP requests will be slow due to a lack of support for io_uring's `connect()` operation.
+
+If you're using Ubuntu 20.04, here's how to install a [newer kernel](https://wiki.ubuntu.com/Kernel/LTSEnablementStack):
+
+```bash
+# If this returns a version >= 5.6, you don't need to do anything
+uname -r
+
+# Install the official Ubuntu hardware enablement kernel
+sudo apt install --install-recommends linux-generic-hwe-20.04
+```
+
+{% /details %}
+
+## Manage dependencies
+
+### `bun install`
+
+To install all dependencies of a project:
+
+```bash
+$ bun install
+```
+
+On Linux, `bun install` tends to install packages 20-100x faster than `npm install`. On macOS, it's more like 4-80x.
+
+![package install benchmark](https://user-images.githubusercontent.com/709451/147004342-571b6123-17a9-49a2-8bfd-dcfc5204047e.png)
+
+Running `bun install` will:
+
+- **Install** all `dependencies`, `devDependencies`, and `optionalDependencies`. Bun does not install `peerDependencies` by default.
+- **Run** your project's `{pre|post}install` scripts at the appropriate time. For security reasons Bun _does not execute_ lifecycle scripts of installed dependencies.
+- **Write** a `bun.lockb` lockfile to the project root.
+
+To install in production mode (i.e. without `devDependencies`):
+
+```bash
+$ bun install --production
+```
+
+To perform a dry run (i.e. don't actually install anything):
+
+```bash
+$ bun install --dry-run
+```
+
+To modify logging verbosity:
+
+```bash
+$ bun install --verbose # debug logging
+$ bun install --silent  # no logging
+```
+
+{% details summary="Configuring behavior" %}
+The default behavior of `bun install` can be configured in `bun.toml`:
+
+```toml
+[install]
+
+# whether to install optionalDependencies
+optional = true
+
+# whether to install devDependencies
+dev = true
+
+# whether to install peerDependencies
+peer = false
+
+# equivalent to `--production` flag
+production = false
+
+# equivalent to `--dry-run` flag
+dryRun = false
+```
+
+{% /details %}
+
+### `bun add`
+
+To add a particular package:
+
+```bash
+$ bun add preact
+```
+
+To specify a version, version range, or tag:
+
+```bash
+$ bun add zod@3.20.0
+$ bun add zod@^3.0.0
+$ bun add zod@latest
+```
+
+To add a package as a dev dependency (`"devDependencies"`):
+
+```bash
+$ bun add --development @types/react
+$ bun add -d @types/react
+```
+
+To add a package as an optional dependency (`"optionalDependencies"`):
+
+```bash
+$ bun add --optional lodash
+```
+
+To install a package globally:
+
+```bash
+$ bun add --global cowsay # or `bun add -g cowsay`
+$ cowsay "Bun!"
+ ______
+< Bun! >
+ ------
+        \   ^__^
+         \  (oo)\_______
+            (__)\       )\/\
+                ||----w |
+                ||     ||
+```
+
+{% details summary="Configuring global installation behavior" %}
+
+```toml
+[install]
+# where `bun install --global` installs packages
+globalDir = "~/.bun/install/global"
+
+# where globally-installed package bins are linked
+globalBinDir = "~/.bun/bin"
+```
+
+{% /details %}
+To view a complete list of options for a given command:
+
+```bash
+$ bun add --help
+```
+
+### `bun remove`
+
+To remove a dependency:
+
+```bash
+$ bun remove preact
+```
+
+## Git dependencies
+
+To add a dependency from a git repository:
+
+```bash
+$ bun install git@github.com:moment/moment.git
+```
+
+Bun supports a variety of protocols, including [`github`](https://docs.npmjs.com/cli/v9/configuring-npm/package-json#github-urls), [`git`](https://docs.npmjs.com/cli/v9/configuring-npm/package-json#git-urls-as-dependencies), `git+ssh`, `git+https`, and many more.
+
+```json
+{
+  "dependencies": {
+    "dayjs": "git+https://github.com/iamkun/dayjs.git",
+    "lodash": "git+ssh://github.com/lodash/lodash.git#4.17.21",
+    "moment": "git@github.com:moment/moment.git",
+    "zod": "github:colinhacks/zod"
+  }
+}
+```
+
+## Tarball dependencies
+
+A package name can correspond to a publically hosted `.tgz` file. During `bun install`, Bun will download and install the package from the specified tarball URL, rather than from the package registry.
+
+```json#package.json
+{
+  "dependencies": {
+    "zod": "https://registry.npmjs.org/zod/-/zod-3.21.4.tgz"
+  }
+}
+```