feat: localisation for about page

public/localisation/en/about.md

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+## Anopaper - anonymous notes service
+
+## AnoPaper allows you to save and share notes anonymously.
+
+### Functionality:
+
+- Notes support markdown format. For example, the entry: `### Level 3 Heading` would look like this:
+
+> ### Level 3 heading
+
+**Mathjax syntax is also supported** For example: `$\sum{i=1}^n i^2$` would look like this: $\sum_{i=1}^n i^2$
+
+- Public notes are available only by link.
+- When you click on the link, the note is saved locally and deleted from the server.
+- Non-public notes are saved locally and are not sent to the server.`