feat(page): add Terms of Service page

This commit introduces ToS page includig network rules by Cesnet and Rules of Use by MetaCentrum

content/cloud/terms-of-service/index.md

+---
+title: "Terms of Service"
+date: 2021-07-21T09:22:35+02:00
+draft: false
+weight: 200
+disableToc: true
+---
+
+The following documents describe your rights and responsibilities as a user of MetaCentrum Cloud.
+
+- Terms and conditions for the access to the CESNET e-infrastructure: [EN](https://www.cesnet.cz/conditions/?lang=en) | [CZ](https://www.cesnet.cz/podminky/)
+- NGI MetaCentrum - Rules of Use: [EN](https://www.metacentrum.cz/en/about/rules/index.html) | [CZ](https://www.metacentrum.cz/cs/about/rules/index.html)
\ No newline at end of file