fix: resolve Docusaurus build (gnolang#1351)

## Description

This PR fixes dangling HTML tags in the Docusaurus config, as well as
introduces a workflow file that will make sure the Docusaurus
documentation is built correctly

<details><summary>Contributors' checklist...</summary>

- [x] Added new tests, or not needed, or not feasible
- [x] Provided an example (e.g. screenshot) to aid review or the PR is
self-explanatory
- [x] Updated the official documentation or not needed
- [x] No breaking changes were made, or a `BREAKING CHANGE: xxx` message
was included in the description
- [ ] Added references to related issues and PRs
- [ ] Provided any useful hints for running manual tests
- [ ] Added new benchmarks to [generated
graphs](https://gnoland.github.io/benchmarks), if any. More info
[here](https://github.com/gnolang/gno/blob/master/.benchmarks/README.md).
</details>

---------

Co-authored-by: Danny <[email protected]>

.github/workflows/docusaurus.yml

@@ -0,0 +1,29 @@
+name: docusaurus build
+on:
+  pull_request:
+    paths:
+      - "docs/**"
+  push:
+    branches: [ "master" ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v4
+
+    - name: Set up Node.js
+      uses: actions/setup-node@v3
+      with:
+        node-version: '18'
+
+    - name: Install Docusaurus Dependencies
+      run: |
+        cd misc/docusaurus
+        yarn install
+
+    - name: Build Docusaurus Docs
+      run: |
+        cd misc/docusaurus
+        yarn build

docs/explanation/gnovm.md

@@ -22,6 +22,6 @@ This enables non-web3 developers to contribute without requiring an understandin
 
 ## Getting started
 
-Install [`gno`](./cmd/gno) and refer to the [`examples`](../examples) folder to start developing contracts.
+Install [`gno`](../getting-started/local-setup.md) and refer to the [`examples`](https://github.com/gnolang/gno/tree/master/examples) folder to start developing contracts.
 
-Check the [Makefile](./Makefile) to enhance GnoVM, Gnolang, and stdlibs.
+Check the [Makefile](https://github.com/gnolang/gno/blob/master/gnovm/Makefile) to enhance GnoVM, Gnolang, and stdlibs.

docs/how-to-guides/creating-grc20.md

@@ -16,7 +16,7 @@ Our _GRC20_ Realm will have the following functionality:
 
 ## Prerequisites
 
-We will proceed using the typical directory structure for a Realm found within the [simple-contract guide](simple-contract.md). It is also worthwhile to consult the [GRC20 interface](../../examples/gno.land/p/demo/grc/grc20/igrc20.gno) which we will be importing and utilizing within this guide.
+We will proceed using the typical directory structure for a Realm found within the [simple-contract guide](simple-contract.md). It is also worthwhile to consult the [GRC20 interface](https://github.com/gnolang/gno/blob/master/examples/gno.land/p/demo/grc/grc20/igrc20.gno) which we will be importing and utilizing within this guide.
 
 ## 1. Importing token package
 For this realm, we'll want to import the `grc20` package as this will include the main functionality of our token factory realm.
@@ -54,7 +54,7 @@ In this code preview, we have:
 
 ## 2. Adding token functionality
 
-The following section will be about introducing Public functions to expose functionality imported from the [grc20 package](../../examples/gno.land/p/demo/grc/grc20).
+The following section will be about introducing Public functions to expose functionality imported from the [grc20 package](https://github.com/gnolang/gno/tree/master/examples/gno.land/p/demo/grc/grc20).
 
 [embedmd]:# (../assets/how-to-guides/creating-grc20/mytoken-2.gno go)
 ```go

docs/how-to-guides/creating-grc721.md

@@ -20,7 +20,7 @@ Our _GRC721_ Realm will have the following functionality:
 
 We will proceed using the typical directory structure for a Realm found within
 the [simple-contract guide](simple-contract.md). It is also worthwhile to consult
-the [GRC721 interface](../../examples/gno.land/p/demo/grc/grc721/igrc721.gno) which we will be borrowing from within
+the [GRC721 interface](https://github.com/gnolang/gno/blob/master/examples/gno.land/p/demo/grc/grc721/igrc721.gno) which we will be borrowing from within
 this guide.
 
 ## 1. Importing token package
@@ -59,7 +59,7 @@ In this code preview, we have:
 ## 2. Adding token functionality
 
 The following section will be about introducing Public functions to expose functionality imported from
-the [grc721 package](../../examples/gno.land/p/demo/grc/grc721).
+the [grc721 package](https://github.com/gnolang/gno/tree/master/examples/gno.land/p/demo/grc/grc721).
 
 [embedmd]:# (../assets/how-to-guides/creating-grc721/mynonfungibletoken-2.gno go)
 ```go