Add sponsors and footer to docs

Author: kzu

docs/footer.md

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+# Sponsors 
+
+<!-- include sponsors.md -->
+
+<br><br>
+<a href="https://github.com/sponsors/devlooped" title="Sponsor this project">
+  <img src="https://github.com/devlooped/sponsors/blob/main/sponsor.png" />
+</a>
+<br>
+
+[Learn more about GitHub Sponsors](https://github.com/sponsors)

docs/sponsors.md

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+<!-- sponsors -->
+
+<a href='https://github.com/KirillOsenkov'>
+  <img src='https://github.com/devlooped/sponsors/raw/main/.github/avatars/KirillOsenkov.svg' alt='Kirill Osenkov' title='Kirill Osenkov'>
+</a>
+<a href='https://github.com/augustoproiete'>
+  <img src='https://github.com/devlooped/sponsors/raw/main/.github/avatars/augustoproiete.svg' alt='C. Augusto Proiete' title='C. Augusto Proiete'>
+</a>
+<a href='https://github.com/sandrock'>
+  <img src='https://github.com/devlooped/sponsors/raw/main/.github/avatars/sandrock.svg' alt='SandRock' title='SandRock'>
+</a>
+<a href='https://github.com/aws'>
+  <img src='https://github.com/devlooped/sponsors/raw/main/.github/avatars/aws.svg' alt='Amazon Web Services' title='Amazon Web Services'>
+</a>
+<a href='https://github.com/MelbourneDeveloper'>
+  <img src='https://github.com/devlooped/sponsors/raw/main/.github/avatars/MelbourneDeveloper.svg' alt='Christian Findlay' title='Christian Findlay'>
+</a>
+<a href='https://github.com/clarius'>
+  <img src='https://github.com/devlooped/sponsors/raw/main/.github/avatars/clarius.svg' alt='Clarius Org' title='Clarius Org'>
+</a>
+<a href='https://github.com/MFB-Technologies-Inc'>
+  <img src='https://github.com/devlooped/sponsors/raw/main/.github/avatars/MFB-Technologies-Inc.svg' alt='MFB Technologies, Inc.' title='MFB Technologies, Inc.'>
+</a>
+
+<!-- sponsors -->