🚀 Feature: Increasing SVG icon libraries count

[kubinka0505]

Description

I see that this repository adds only one icon library, aside of SimpleIcons used by shields.io, which is a shame.

Is there a possibility of adding more icon libraries? I understand that this increase bandwidth or cause other issues, nonetheless I dare to say that amounts of icons in the Octicons library may be insufficient for some cases, since there are only around 250 of them, which - compared to library used by shields - feels like a small fraction.

Here is a table (sorted by stars amount) containing worth-checking repositories with icons:	Supported	Repository	Author	Icons1	Stars	Primary Language	License
#959	feather	feathericons	1953	23787	84.3% JavaScript	MIT
	ionicons	ionic-team	1338	17032	76.7% TypeScript	MIT
	tabler-icons	tabler	4619	15862	56.3% HTML	MIT
	flag-icons	lipis	268	9657	59.8% CSS	MIT
	icons	twbs	287	6856	96.4% JavaScript	MIT
	weather-icons	erikflowers	222	6721	59.7% CSS	SIL OFL 1.1

¹ - esmaited amount, counted from repository files

---

If introduced - what I'm looking straightforward to - libraries in URLs can be distinguished by their names.

• logo=paintbrush -> logo=octicons-paintbrush

[DenverCoder1]

Sounds like a good idea, maybe an alternative for hyphenating the logo names could be to supply the source as a path or query parameter, for example /badge/custom-badge-blue.svg?logo=star&logoSource=octicons. That way it would be easier to determine the source to look in without splitting the logo name and requiring some names to be reserved.

To avoid making it a breaking change, the default behavior would of course be to default to octicons then the database then shields.io (simpleicons) if the source is not specified. The database and Shields.io could always be used as a fallback if the specified logo is not found in the specified source.

[DenverCoder1]

Added support for feather icons in #959