Add DevLab to Encoders/Decoders and Regex testing section

[bikram13]

What this adds

DevLab in the Encoders/Decoders and Regex testing section — alongside Regex101, RegExr, CyberChef, and URL Encode/Decode.

DevLab is a free browser-based toolkit that bundles the most common developer encoding/testing tools in one place:

• Regex tester (live match highlighting, all flags, named groups)
• JWT decoder (header/payload/signature with claim inspection)
• Base64 encoder/decoder
• URL encoder/decoder
• Hash generator (MD5, SHA-1, SHA-256, SHA-512)
• JSON formatter, validator, minifier
• Text diff checker
• And more

Everything runs client-side. No account, no rate limits, no API keys needed.