chore: add testimonials from comprehensive platform sweep (#10)

## Summary

Swept 10+ platforms for new testimonials and expanded the collection from ~55 to 75 entries.

**Sources swept:**
- Discord: Naomi's Nocturne, freeCodeCamp, Commit Your Code!, Deepgram (4 servers)
- Deepgram Slack (kudos channel + broader sweep)
- freeCodeCamp Google Chat
- LinkedIn (verified all 24 recommendations, added missing Quincy Larson entry)
- Bluesky (@naomi.lgbt notifications sweep)
- freeCodeCamp Forum
- Dev.to, Hashnode, GDG Memphis/Reddit
- GitHub, Medium, YouTube, Product Hunt — audited (dry)

**Changes:**
- Added 20 new testimonials
- Removed 1 duplicate entry
- Fixed typo in one existing entry (Nielda Karla Melo)
- Anonymised internal/workplace feedback (Deepgram Slack, fCC Google Chat) per privacy standards

✨ This PR was created with help from Hikari~ 🌸

Reviewed-on: #10
Co-authored-by: Hikari <hikari@nhcarrigan.com>
Co-committed-by: Hikari <hikari@nhcarrigan.com>

cspell.json

@@ -3,6 +3,7 @@
     "language": "en-GB",
     "words": [
         "Abalise",
+        "Anny",
         "Aeris",
         "Alix",
         "Alouette",
@@ -13,11 +14,18 @@
         "Aureline",
         "Azuliah",
         "becca",
+        "blackpug",
+        "blairingmysoul",
+        "blinged",
+        "bsky",
         "beccalia",
         "caelia",
         "Calenelle",
         "callista",
         "cashapp",
+        "catz",
+        "codeofdreams",
+        "Creater",
         "Celestine",
         "Caylus",
         "Chibika",
@@ -27,6 +35,7 @@
         "Elaria",
         "Elowyn",
         "Elunara",
+        "favorite",
         "Francez",
         "gitea",
         "Gooch",
@@ -36,16 +45,22 @@
         "Isekai",
         "iuvo",
         "Jaoude",
+        "Karla",
         "Karlo",
         "Katey",
         "Keiko",
         "Kuroko",
         "Lamonica",
+        "lilykhan",
         "Liora",
+        "Lowkey",
         "Lynira",
         "lyria",
         "Manushev",
+        "manuarora",
         "maribelle",
+        "minjo",
+        "modeling",
         "maylin",
         "Meliora",
         "Melo",
@@ -60,13 +75,17 @@
         "nymira",
         "Nomena",
         "Ohman",
+        "Oliff",
         "opencollective",
         "oriana",
         "pavelle",
+        "plamoni",
+        "procz",
         "Qais",
         "Ranjan",
         "Rennemeyer",
         "Rion",
+        "roseaboveit",
         "rosalia",
         "ruus",
         "Ruutuli",
@@ -89,6 +108,7 @@
         "thessalia",
         "Tihomir",
         "UFCW",
+        "womens",
         "Urmatan",
         "Umbrelle",
         "Vajda",