add concept quick start page

outling the target user flow we are aiming for

src/routes/concept/+page.svelte

@@ -0,0 +1,31 @@
+<script lang="ts">
+  import AlertError from "$lib/components/AlertError.svelte"
+  import Container from "$lib/components/Container.svelte"
+  import SvelteMarkdown from 'svelte-markdown'
+
+  async function get_md() {
+      const res = await fetch("/concept.md");
+      return await res.text()
+  }
+</script>
+
+<svelte:head>
+  <title>GitWorkshop: Concept</title>
+</svelte:head>
+
+<Container>
+  {#await get_md()}
+    <p>loading...</p>
+  {:then md}
+    <article class="prose prose-sm mt-3">
+      <SvelteMarkdown
+        options={{ gfm: true }}
+        source={md}
+      />
+    </article>
+  {:catch error}
+    <AlertError>
+      {error.message}
+    </AlertError>
+  {/await}
+</Container>

static/concept.md

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+# Concept ngit quick start guide
+
+This is a concept which the developer would like to work towards. a lot of the features / commands are not available yet.
+
+## How it Works
+
+nostr is a decentralised communications protocol with:
+ - permissionless account creation - created via a public/private key pair
+ - verifiable signed messages
+ - messages transported via relays rather than P2P
+
+Code Collaboration via Nostr
+
+ * proposals (PRs), issues and related discussion, status, etc. are sent / recieved via nostr.
+ * repository state stored in nostr.
+ * git server(s) still required for data storage and transport but they act as dumb relays (apart from use for CI/CD).
+   maintainers can change git servers via nostr and users will automatically start using the new git server.
+
+[insert diagram which makes git severs appear like just another nostr relay - potentially something like this:]
+```
+             ┌──────────┐                           
+             │  Author  │
+             └──/─┬─\───┘
+        ,------'  │  '--------.-------.     
+┌──────▼─┐   ┌────▼───┐   ┌───▼───┐  ┌─▼─────┐  ┌───────┐
+│  Git   │   │  Git   │   │ Relay │  │ Relay │  │ Relay │
+│ Server │   │ Server │   │       │  │       │  │       │
+└────────┘   └────\───┘   └───┬───┘  └──/────┘  └─/─────┘
+                   \----*-.   │   ,----/---------/     
+                         ┌─▼──▼──▼─┐
+                         │  User   │
+                         └─────────┘              
+```
+\* git servers are used as dumb relays with content verified via nostr events.
+
+## Contributor's Quick Start Guide
+
+1. install ngit
+ * download [linux windows mac] (vX.X)  add binaries $PATH
+ * OR if you have cargo use `cargo install ngit`
+2. find repository
+   * using `ngit search` eg `ngit search amethyst`
+      ```
+        name        maintainer(s) starred by
+      > amethyst    👥Vitor       Gigi, fiatjaf, franzap, +5 👥
+        amethyst    impersonator  
+      ```
+   * OR using gitworkshop.dev
+      * browse https://gitworkshop.dev/repos for the repository
+      * explore proposals and issues
+      * copy the naddr (or press the green clone button to copy the clone command)
+3. clone repository
+ `git clone nostr://naddr123...`
+4. view open proposals
+   * `ngit list` - select proposal from titles to checkout branch or apply to current branch tip
+   * OR review branches starting with 'origin/prs/*' with your favourate git tool
+     * eg. for git cli use `git branch -r --list origin/prs/` to list and `git switch prs/add-offline-mode[e9ra8281]` to check out
+     * view and contribute to the proposal discussion on gitworkshop.dev
+5. submit proposal
+   * `ngit send` to send with options
+   * OR `git push -u` on a branch without an exisitng upstream will submit it as a proposal without commentary if you are not a maintainer 
+6. update proposal
+   * `git push` from your proposal branch
+7. download releases using `ngit releases amethyst`
+    ```
+      name        maintainer(s) starred by
+    > amethyst    👥Vitor       Gigi, fiatjaf, franzap, +5 👥
+      amethyst    impersonator  
+    ```
+
+    ```
+    amethyst by 👥Vitor
+    --------------------------------------
+      release                      # files
+    > v0.87.7: Revert Save button  14
+      v0.87.6                      14
+      v0.87.5                      14
+    ...
+    ```
+
+    ```
+    amethyst by Vitor
+    --------------------------------------
+    download v0.87.7: Revert Save button (14 files)
+      all (14 files)
+    > amethyst-fdroid-arm64-v8a-v0.087.7.apk
+      amethyst-fdroid-armeabi-v8a-v0.087.7.apk
+      amethyst-fdroid-universal-v8a-v0.087.7.apk
+    ...
+    ```
+
+    ```
+    downloaded to ./amethyst-fdroid-arm64-v8a-v0.087.7.apk
+    checksum verified
+    ```
+
+## Maintainer's Quick Start Guide
+0. for completely fresh git repositories
+   1. create a new local git repository
+      * `git init`
+      * add an initial commit with a `README.md`
+   2. setup a git server with PRs and Issues disabled
+      * github guide, codeberg guide, self host (gitea/forgejo guide)
+
+1. install ngit
+   * download [linux windows mac] (vX.X)  add binaries $PATH
+   * OR if you have cargo use `cargo install ngit`
+2. initalize on nostr
+   * run `ngit init` from git repository, which will:
+   1. announce with setting such as:
+      * inbox relays - where contributors should send proposals / issues
+      * clone - git server(s) to fetch data from
+      * settings can be updated by running `ngit init` again
+   2. publish state
+      * from branch / tag refs on first git server in announcement
+   3. add nostr as git remote
+      * `git push` will now update state on nostr and push data to all git servers listed in annonucment event
+3. manage proposals
+   * view and apply open proposals (see contributor guide)
+   * use gitworkshop.dev to comment on or close it
+   * if you applied a proposal to master or used `git merge`, the proposal status will be updated when you push those commits
+4. issue releases
+  [TODO]
+5. update comms - direct contributors to use nostr. eg. on readme and website.