Add note for reverse proxy.

Li Ian-Xue (b4283)Mon Sep 27 20:50:46+0300 2021

02fb9ab

Add note for reverse proxy.

README.md

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It was tested on Guile 2.2.7 and 3.0.7.  Many thanks to the Guile
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development team for such great software.
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## Reverse Proxy
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It may be desirable to setup a reverse proxy on Apache Httpd (also a memo
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for myself), so you don't have to expose the 8080 or whatever port:
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```
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    <Location "/pastebin">
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        ProxyPass "http://your_address:8080"
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        ProxyPassReverse "http://your_address:8080"
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        ProxyHTMLEnable On
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        ProxyHTMLDocType "<!DOCTYPE html>"
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        ProxyHTMLURLMap "/" "/pastebin/"
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    </Location>
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```
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