📝 Migrate from Docusaurus to Mintlify (#1115)

Closes #868

apps/docs/editor/blocks/logic/set-variable.mdx

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+---
+title: Set variable
+icon: pen
+---
+
+The "Set variable" block allows you to set a particular value to a variable.
+
+<Frame>
+  <img src="/images/blocks/logic/set-variable.png" alt="Set variable" />
+</Frame>
+
+## Custom
+
+You can set your variable with any value with `Custom`. It can be any kind of plain text but also **Javascript code**.
+
+### Expressions with existing variables
+
+It means you can apply operations on existing variables.
+
+Add a value to your variable:
+
+```
+{{Score}} + 5
+```
+
+Compute a sum of variables:
+
+```
+{{Score}} + {{Answer}}
+```
+
+Multiply variables together:
+
+```
+{{Score}} * {{Multiplier}}
+```
+
+Compute a percentage:
+
+```
+{{Score}} * 100 / {{Max Score}}
+```
+
+Extract the first name from a full name:
+
+```
+{{Full name}}.split(' ')[0]
+```
+
+Transform existing variable to upper case or lower case:
+
+```
+{{Name}}.toUpperCase()
+```
+
+```
+{{Name}}.toLowerCase()
+```
+
+This can also be Javascript code. It will read the returned value of the code and set it to your variable.
+
+```js
+const name = 'John' + 'Smith'
+return name
+```
+
+If you don't provide the `return` keyword then it will be automatically prepended to the beginning of your code.
+
+```js
+'John' + 'Smith'
+```
+
+is the same as
+
+```js
+return 'John' + 'Smith'
+```
+
+<Info>
+Variables in script are not parsed, they are evaluated. So it should be treated as if it were real Javascript variables.
+
+So, if you write `"{{My variable}}"`, it will parse the variable ID (something like `vclfqgqkdf000008mh3r6xakty`). You need to remove the double quotes to properly get the variable content value.
+
+For example,
+
+- ❌ `"{{URL base}}/path"` => `vclfqgqkdf000008mh3r6xakty/path`
+- ✅ `{{URL base}} + '/path'` => `https://domain.com/path`
+- ✅ `` `${{{URL base}}}/path` `` => `https://domain.com/path`
+
+</Info>
+
+## Moment of the day
+
+It will set your variable with either one of these values based on the user's time of the day: `morning`, `afternoon`, `evening`, `night`.
+
+Then you can use this variable to conditionally display content:
+
+<Frame style={{ maxWidth: '400px' }}>
+  <img
+    src="/images/blocks/logic/moment-condition.png"
+    alt="Moment of the day condition"
+  />
+</Frame>
+
+## Map item with same index
+
+This is a convenient value block that allows you to easily get an item from a list that has the same index as an item from another list.
+
+When you are pulling data from another service, sometimes, you will have 2 lists: `Labels` and `Ids`. Labels are the data displayed to the user and Ids are the data used for other requests to that external service.
+
+This value block allows you to find the `Id` from `Ids` with the same index as `Label` in `Labels`
+
+<Frame>
+  <img
+    src="/images/blocks/logic/set-variable-map-item.png"
+    alt="Set variable map item with same index"
+  />
+</Frame>